Malicious PDF — malware analysis report

Static analysis result for SHA-256 defd2c8f48f5bd9f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-12 07:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b945caec9adab834e68296a07d975664 SHA-1: b148ada83f60eb79cd9076a34db5f3733e96f91d SHA-256: defd2c8f48f5bd9f49bf63876c8437961cb62e73bf558e1bc6b5ea62cd5a7382
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on disposable domains. This behavior is indicative of SEO spam or a phishing campaign aiming to drive traffic to malicious or deceptive content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://nipisod.ru/award?keyword=pdf+broiler+farming+business+plan PDF link annotation
    • http://help-lnstagram-verifycopyrgiht.com/arabic_kadaloram_remix_song_free9z71q.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/how_to_complete_certified_mail.pdfIn PDF document text
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/2993215.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/88fa07297c06888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_6040b2ae5c20d.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/jibQXAU/zevomujesutijunovemiwara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_60139fd163227.pdfIn PDF document text
    • https://lifefoxametuzov.weebly.com/uploads/1/3/1/3/131383893/b6e937f27f84d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5fca9cd6a185f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_603c78fb96fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5fd7d37d3b3b2.pdfIn PDF document text
    • http://lnstagramsupportlives.com/free_ringtones_for_apple_iphone_xrmxt96.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/5324278035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fee46a889ff9.pdfIn PDF document text
    • https://cdn.sqhk.co/fasuzozo/givcwhg/jivebitakekomov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6039c4f27e8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_603a03580d1c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulutugorivexek.atwebpages.com/rovosevak.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/why_my_dishwasher_isnt_cleaning.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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 5504 bytes
SHA-256: bf6073f4597a56138d4d27bfda2d2e9412d10e039d3c9c97b8943c62b2d82e32
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10248 bytes
SHA-256: 757ecf9e358e52da6b708b5ff65aa39329b70432e71437269d47c8aefdcf5c2d

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