Malicious PDF — malware analysis report

Static analysis result for SHA-256 a853d421e3be7f59…

MALICIOUS

PDF

82.8 KB Created: 2021-05-30 20:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9a8bab529f0f12d999fbdc848cd69803 SHA-1: e5aaf6734fdadd799e586de44f32a116886d4034 SHA-256: a853d421e3be7f59e25144ca736f62bd018af4df48ef8dc7e0b9a69da6f0c8f5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, with a primary suspicious URL pointing to a domain associated with phishing or malware distribution. The document's content, though garbled, suggests a lure related to exam papers, aiming to trick users into clicking these links. The presence of many external links and the use of disposable hosting services further support its role as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=bhu+mca+entrance+exam+question+paper+with+answers+pdf PDF link annotation
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/vibir.pdfIn PDF document text
    • https://xizotuvulozig.weebly.com/uploads/1/3/1/8/131856772/6452849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6009dfad2263b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fe15ec4d868b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457839/normal_60aff66661ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6023de6d75eb2.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/zojirofor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_606e564988068.pdfIn PDF document text
    • https://garevanixuxud.weebly.com/uploads/1/3/4/3/134371644/vuranosodaxi-zozoxuka-bugonut.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/3743853.pdfIn PDF document text
    • https://vavunoruluso.weebly.com/uploads/1/3/1/0/131070491/mitepikijulexire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fe2b62feca81.pdfIn PDF document text
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/jowojokimigokox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_605482f01df64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1a05d04-8080-468d-8e1e-58dc5b4f7478/plant_physiology_and_biochemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e244202a-1ff6-46e8-9480-3741565cccbd/38980721669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac64459-ce45-41a9-be86-2d7370a43077/how_to_use_3d_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5609064-af11-4c99-9eab-360f991118f0/12011228422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5a62bd-08b0-4cbf-9b19-b9c15e840400/big_green_egg_grill_brush_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf5d43b-856e-4eaa-8445-a3b6268902ef/list_of_subordinating_conjunctions_for_complex_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973b3a58-e053-435f-a1db-4dae623ae402/runurototagurujeren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796c2c8b-1e7d-422f-b7b4-62c956ec457a/49978924871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ade7671-fbaf-4c53-8a6d-9988c211d963/fozakesinipuvekipuvip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 5580 bytes
SHA-256: dcdfef226128ddc7c259e62a9c13ae61c931adb78e5ff5f235050e0fe6a9ed7a
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 11032 bytes
SHA-256: 7015091577ecb2a453d840c1b247643c560a7929b9dcb2c5331dc3eba4a80e7d
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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