Malicious PDF — malware analysis report

Static analysis result for SHA-256 a411cd1f85cd9235…

MALICIOUS

PDF

94.5 KB Created: 2021-04-05 05:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 699282e5582144b0d90b21bda7ead07b SHA-1: 9e5c881ae342d587506d21a9caa5fae2e213d233 SHA-256: a411cd1f85cd9235d0147a1fb9ac51f563d78b177e09aae52679cf690519b6e8
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/award?keyword=animals+sounds+and+pictures+pdf PDF link annotation
    • http://jenerotisa.mywebcommunity.org/92718465643.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/sofifexotajimuvirut.pdfIn PDF document text
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/5521279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_604d8b0ddb8bb.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/xawerasofome.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/xenifexubiwabimozodokamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5fdc6b084d435.pdfIn PDF document text
    • http://nakozek.mypressonline.com/kirowiwibiz.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/40710971498.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/life_of_apollonius_of_tyana.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/9538376.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/blindness_saramago.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/rekujo_xemowetip.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/fupezoziroxutududede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_600fd65d1baf3.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://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_fefc7129629143778e0ffe5c50cdaa07.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_a0c157510939487c8ae23005fffcbbf1.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/rinuxarubuloxokiki.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_ade507c92f3249b983742b761d4ab50c.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_369a2747ec044301a41ad8f51f2ee9e9.pdf?index=trueIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/why_does_my_acer_tablet_wont_turn_on.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_9b2238180f98441a8c58da29eab71238.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 5172 bytes
SHA-256: d96bea5fc06931098182f51198b990af544ed5800bf2405ae1ec6014d3cc077d
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 6348 bytes
SHA-256: db6ece045ff4de0e9cc933526355e41c1e12cf80d8fb4dc9256455cb45e590e3
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 11100 bytes
SHA-256: f9a885d89e66e72bd063747c65be8f5deb21673d25aed64751471f1545f44220
font_03_sfnt_off00015db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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