Malicious PDF — malware analysis report

Static analysis result for SHA-256 5089e3242bdd6e88…

MALICIOUS

PDF

81.1 KB Created: 2021-03-06 10:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0364811bf1241dfaafc2ad3f61e0de93 SHA-1: b08938ea96e411cb642d78d35c9cb75f8ea9482b SHA-256: 5089e3242bdd6e882f59329eb1f70c557fa1ab07671a4459dd4478f8678ee1e4
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 domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=save+text+file+html5 PDF link annotation
    • http://allieshouseofhope.com/savosuti1vo31.pdfIn PDF document text
    • http://znakomstva18x.site/batutuuppm0.pdfIn PDF document text
    • http://prequester.online/849596018m0plv.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/c5a20cec-255a-4daa-8168-337e92d73790/64996286520.pdfIn PDF document text
    • http://zobotipuzadevi.epizy.com/siwofemafujawiwenurok.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_efd36164386e4060964ae7b1039f800c.pdf?index=trueIn PDF document text
    • http://bufizufidubak.rf.gd/bonding_and_shapes_of_molecules_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9613b3dd-79b8-4156-8c0f-d8533f0aa657/24363943213.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b010e364c7c747c98c257bf4fe9dbdee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28f4b7c-1673-4747-824a-17193e76f0fc/bijipoxopevi.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_485870e5680e40b080f3d7bec9d7de01.pdf?index=trueIn PDF document text
    • http://gesasodalunaka.epizy.com/bunipasipovatinegufevu.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_4c675300beb94efb9384c82d54ae67a9.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_db9d6d555ba54924b45d5a398b98a4a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87efebeb-bbab-4af0-93f8-5d4a0f3ce35c/emily_dickinson_poem_hope_summary.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_157c3fb657854d0f993b343a32184056.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9b134b-3bb2-4cff-9c2b-3a3c38e45b23/whirlpool_dishwasher_wdf320padw1.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_9577602bf9a84f139b2f0443e498b88f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dd0d3a-6f39-4593-aded-d098ba51c433/what_are_the_specials_at_arbys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e395cc13-5bc1-4639-95af-02cb52c0f72b/how_much_is_procreate_for_ipad_australia.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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5088 bytes
SHA-256: db13fc2ac9c5e36479a0c533e8a6e8b2823ec3620b9dbfa2f83a7a310a2cfbd5
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 11908 bytes
SHA-256: 065b61b63265ab6d0c8ef36a9f69859b5797712a896ffc29d50452e94d42ea85