Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d13943575983857…

MALICIOUS

PDF

80.5 KB Created: 2021-03-27 09:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c834e146950ab3c6db500ba217df1f2 SHA-1: b3e3e642ad9e880855032b6fa3b9cb3d66ae54d1 SHA-256: 7d13943575983857fc448455c08f2b258950b0f2e95901cc12adc3e85a737a54
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://zajinet.ru/wix?keyword=lies+we+believe+about+god+paul+young+pdf PDF link annotation
    • https://wabupakiwe.weebly.com/uploads/1/3/6/0/136057256/visafi.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/299527.pdfIn PDF document text
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/mugenegevowipidowifa.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/oxford_dictionary_synonyms_and_antonyms.pdfIn PDF document text
    • http://ita-bio.space/exercices_sur_le_groupe_nominal_cm14zyy6.pdfIn PDF document text
    • http://phtech.site/nepowebalifeginf834.pdfIn PDF document text
    • https://xuxamiwi.weebly.com/uploads/1/3/4/6/134624415/181444.pdfIn PDF document text
    • http://clubstore.pro/back_scratch_test_strengthndjeg.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/cae14079a4c0b.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/zesixaxi.pdfIn PDF document text
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/vegubekukipit_zijor_muniri_meresegap.pdfIn PDF document text
    • http://astropsychology.website/partnership_business_agreement_templatey1lb8.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/8154046.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/2744670.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/hp_probook_6470b_battery_price_in_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_0ed76cce348848e8a4512529b0870499.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_efbd3a72e09f4c189b4a4eda52385c19.pdf?index=trueIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_2c7fa68e17d947e784238494e3c1e0eb.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_fdff37389a4c44bb96c9a2508ce5142e.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_421154986b214313bcda5c6355f1da55.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_3910261bacd34c2abb9b3d33f5b623ae.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_a41844484ae049228b2e3d893f7ad894.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 5448 bytes
SHA-256: 937adea7f7afbb020fe1f6e2da6d512b8750318c1deee935db5a556ce0bfd3e2
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10932 bytes
SHA-256: 6772bb456b62cd4620753eabd3a035614e5b8bbb4fcf58984652a449322f13e3