Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa388bfcbe4204d…

MALICIOUS

PDF

70.1 KB Created: 2021-03-16 12:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 404400a9b0523da1f1382388822b4113 SHA-1: 15bbeb208f729944baae9306ae339f70a25f72ea SHA-256: 8aa388bfcbe4204d41bea6e3f8dd2b19b0f74a18300ee0f4945a28254a556890
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=cla+properties+dekalb+il PDF link annotation
    • http://ig-copyrightnoticehelp.com/how_often_do_you_get_military_clothing_allowanceqqr92.pdfIn PDF document text
    • http://trend-sales.fun/xuvidelixakakutebiwono5af26.pdfIn PDF document text
    • http://formverifiedbadge.com/how_to_start_stihl_mini_boss_chainsawvfcoj.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/85356138662bhkgm.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/16171005243.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/topipereluvo-potis-wezesosokukufi.pdfIn PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/lisuxasamiv-goxilujite.pdfIn PDF document text
    • http://usblighter24.site/how_to_update_fossil_gen_5kocf4.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/1524941319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutogebufuz.myartsonline.com/common_interview_questions_and_answers_for_managers.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/pazebujunuvefo.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_a0a8c8ed3fbd4978a046069347223bc7.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_74ad73c91d2b4af6a747eba2b06e3654.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_c60db1fcb5f34dec9d9fa2474d4ef6dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/human_body_parts_photos.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_8d348100583741e980e58e4a785ce92f.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_1e4a51c4bcb941869500b827370de034.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_f4bdd1e86e1143769a0f09965178d55c.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_215265bd05334b3c87967a1e1819a11f.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_42fcbdd3a9934ebd9fd91b3a701b5e64.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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 5060 bytes
SHA-256: 65b908b2d7e5ef1fb5c5651018c207c2671d91d11ac0ccaddc4446f14d172fb6
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10060 bytes
SHA-256: 61b177c6a3d5e4ef9fa1b6974ee7af97446e28c57c2d4d26eb3f81c43ce5230d