Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac54fdcc2643c19…

MALICIOUS

PDF

69.1 KB Created: 2021-03-31 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8c431c62b5fc05e2dccd2182e73fd1b SHA-1: 8f7dc491c355556c0b2a8a4df087417939289966 SHA-256: eac54fdcc2643c195b42a5c9366e158b5a349181578a51297dcf413144b6796b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=gas+laws+phet+lab+answers PDF link annotation
    • https://cdn.sqhk.co/tatogevi/cgdrzge/octopus_tattoo_sleeve_black_and_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_60565c3f9cd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_603f201f05e98.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/i4e6ygh/mujesuvozirejanapis.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/NgfhakE/78520694595.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/hh5qjf7/80675829794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_604cd940ef07d.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/Eicghia/dungeon_keeper_ios_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_4790762925894706b9092f81c4c06140.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_5775bc9f72bf4c49a66de591c378f06e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b82fd0-e6d4-4a26-ba74-a253ed76b244/standard_tire_size_for_2004_honda_odyssey.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_bcf9948502fc45889964d98f618d141b.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_18bdfc0bee9a4aaebc27a346b71ebb77.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_6ff390f0075c4701a98c9b36d0b77021.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_c4cc8caf186f4e9c9fd486dd08c2860f.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_c34ed33a4f1f4e1988e0686b765f93ca.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_9827fec1810446b6bf100b5a7c5eefd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ad24e4-c8ea-4ad0-a77f-c14c62df5841/73129496807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a3faba-4de9-40b4-8041-79a1646c5e25/monexevat.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_1892fac04354402a85df03babfd76ea5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/faaab589-d0a9-43ba-803e-92b364b89d6a/netgear_wn_3000_rp_handleiding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8d71c1-a4c1-4d69-a6c7-8b411561e51b/14003849721.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 5172 bytes
SHA-256: dab1501f83f6e4189280fd87b77e8b90100b896b44473ffd2d21ff1d8893bb9e
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 10640 bytes
SHA-256: 3c711472aeab3c921c7a9d6267ddb8cdf1182e9c1edd946c89400f1fcbbe5d86