Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6256687658b4b47…

MALICIOUS

PDF

103.4 KB Created: 2021-04-13 14:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 18d5e5959647868f4d6a7ae937438b5f SHA-1: e21028f7265e2709d2a620090e414a980c359268 SHA-256: e6256687658b4b47052b77f6a4c2f26aa9d906fe6b2a2803f3881d44dd13bfd5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=elements+of+continuum+mechanics+and+thermodynamics PDF link annotation
    • http://rebelliona.online/nezusevegigekebukibak0m52.pdfIn PDF document text
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/xowoxekokidemu_dumipigivasoxe_dogum_vepefodelijo.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/kaxowajugi-jariganovase-xagipixoju-fulebuv.pdfIn PDF document text
    • http://namelesssouth.xyz/nazaxefivojtuq0t.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/0a7085a5e.pdfIn PDF document text
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/5d99a756d36e.pdfIn PDF document text
    • https://jirukikemika.weebly.com/uploads/1/3/4/3/134310088/mikem.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/kegiruv.pdfIn PDF document text
    • http://beremoter.online/958686537418jnjb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf44644-3411-4ddc-9499-b0025a3920bd/folalabaw.pdfIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_8f78dceb1e3848c2993d90ee0e908a05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1106f31-a4bb-4106-9146-c6175e7331d8/2000_ford_focus_haynes_manual.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_da2c96fe146546c186401d07e2d90eee.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_bff3d5060da642e796a50d54e9194533.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_b29df6c1fb674e3cb77deb682814ab37.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_99d8a8fb29a242f9a3d789f894f02bff.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_096af3d278154464867a632c7d132276.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aecd666-2125-4fd7-8745-4b20556b844b/kufotapitisajifi.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_855bde1d370a4752bee40ae5f05219f2.pdf?index=trueIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_8fe148e54dbe4fab949e44f00a325d23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac091480-980c-4b9c-9e0a-dfbfc4b6e2cb/53619391690.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 6652 bytes
SHA-256: c411bfd363e6386056d21def95f340b603ed02377407efed32a6c69bbcf0129f
font_01_sfnt_off00013089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 5320 bytes
SHA-256: 5f8219881f180122d94d1e9efd711f7d43f09e1ec040380f7e7ab76ccc3bbceb
font_02_sfnt_off0001427f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427F 15032 bytes
SHA-256: 4e7c641fc81b6ae57faeba24fe2631d7d3f2d6322bcca36809752f8f08dcd8a8
font_03_sfnt_off000174ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EF 17272 bytes
SHA-256: 4ae9247d592ad5c231900fe5e8677edb2ad72d0a65aa62894cbcd297be5e8ae5

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