Malicious PDF — malware analysis report

Static analysis result for SHA-256 d409bcf5e49ae413…

MALICIOUS

PDF

89.8 KB Created: 2021-05-28 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77240895146c242e0b9d9776a268310c SHA-1: d7ac433f75e0722e85365a0940acea4da892e7d5 SHA-256: d409bcf5e49ae413786089612989e698b0d881d8078773b45b9e39957ec82e27
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 0.9990

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://pelibifir.ru/strik?utm_term=german+grammar+drills+second+edition+pdf PDF link annotation
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/babivabegalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_603d4b341928c.pdfIn PDF document text
    • https://nuluvefum.weebly.com/uploads/1/3/3/9/133999802/1111613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_605d95dd1896c.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/lazomikatima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411686/normal_6004e8aa91af6.pdfIn PDF document text
    • https://gokaletuwatuni.weebly.com/uploads/1/3/6/0/136098233/litewa.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/mokezugapirex_labaguvewume_pegopikozufaxe_dafudas.pdfIn PDF document text
    • https://potamowirojix.weebly.com/uploads/1/3/4/6/134688714/9883576.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/petam.pdfIn PDF document text
    • https://vunivukakuxut.weebly.com/uploads/1/3/5/3/135301202/6831955.pdfIn PDF document text
    • https://sawajarenemobo.weebly.com/uploads/1/3/4/4/134494328/ca5fa158.pdfIn PDF document text
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/79587.pdfIn PDF document text
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/puradowi_vagoxavizexewuk_dewef.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/670acd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fcb52476cece.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/7122f4c31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5ff8bfd4ea9e8.pdfIn PDF document text
    • https://pazumiwasosum.weebly.com/uploads/1/3/4/8/134892739/c3ff31565da.pdfIn PDF document text
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/mubowenefewufivam.pdfIn PDF document text
    • https://madoxeviwijiri.weebly.com/uploads/1/3/4/4/134475969/zapux-tametejizuwe-rotegagix.pdfIn PDF document text
    • https://polopiwej.weebly.com/uploads/1/3/4/3/134353222/1689665.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5296 bytes
SHA-256: aee68483c643bacb9897195cbfe02dce5463b8150feace1c723b7e9f73f27722
font_01_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 11580 bytes
SHA-256: 41fa3b2e084e7062e781dbc972402e0cb6456dd3877ebf798189a691ac2aca70
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df
font_03_sfnt_off000148fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176