Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7344bce8bf19b11…

MALICIOUS

PDF

84.1 KB Created: 2021-03-14 22:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11efc3e9206cbae46dd059095c502f85 SHA-1: 8803c2c8b3bc8a8e6c0b9b920c34866ac13060d3 SHA-256: b7344bce8bf19b11afae45f8beee7ff3b1394765c9a9d4eaea76aa79a8250d56
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

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://nipisod.ru/strik?utm_term=first+harry+potter+book+us PDF link annotation
    • https://cdn.sqhk.co/bomumuxa/a2gihcx/78667499321.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/dizijamazo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/eRNogd6/25480006940.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/DH9wwig/wallpapers_hd_pinterest_pc_marvel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe50cee523b0.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/fibuxuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_603560ef51de3.pdfIn PDF document text
    • https://tazorigebug.weebly.com/uploads/1/3/4/7/134766075/nisezojegopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6023d12e85006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373778/normal_5feb0a223a5c5.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/juieohj/kefavise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_604d5d7db5016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5feead5fb16b4.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/aifjfdr/58239643002.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/lgjhjjV/chrome_android_adblock_plugin.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/jfDnigS/cartographers_for_social_equality_episode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416151/normal_600156dfd304c.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/banal-depini-nopelerovir-xajoxeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_603020237788a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_06dadfaf8f4b4c21b0075227d9ce1c55.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5eaa6fe2879749da92760966825e771b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 4912 bytes
SHA-256: 2e71d8705b48a372a8c02f7f3c1c777df966bb82ad3b385e4b057fdc02119d41
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11784 bytes
SHA-256: 76e751288629f5e66a30f01b22688b779a3dad57790e78940c3060b510039ea2
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34