Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea97f16fa54b0d4…

MALICIOUS

PDF

84.2 KB Created: 2021-05-17 01:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f5a32ad741059b617aee8ed07e90bd5 SHA-1: e295a0591ca7215a3cd7a3d7f95b12d78ef359ee SHA-256: fea97f16fa54b0d49a198bba552c071087b61474b91c7f2965d64f97c96ca8d2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The presence of a URL with a search query related to modem replacement suggests a phishing or clickbait lure. ClamAV and ML classifiers confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=can+i+replace+my+optimum+modem PDF link annotation
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/fofoxulebide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_606a5b202762b.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/31807023884.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/luninexikifobezulagal.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/75521949548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_6018677854f30.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/3705812.pdfIn PDF document text
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/3623468.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/madras_university_bcom_general_syllabus.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/387995.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/wibova.pdfIn PDF document text
    • https://xagiwejobumumok.weebly.com/uploads/1/3/6/0/136051235/707a8643eeff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_60031282b6132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feb94863eed1.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/4e6de4d7f72.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/kifojoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_601a99bf3d9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_6059f750a0407.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/bilal_ibn_rabah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafb2a7f-eedd-45d5-9f2c-2ec946ddfc01/42016211686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b6fbb0-ebcf-4166-94d2-bcd5cea981cd/cnn_world_news_today_2020.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_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 5048 bytes
SHA-256: 8a796528ba35b117b24a327954d4f73db2daab89432c64d0d994c8114e12bb0f
font_01_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 11636 bytes
SHA-256: 2450dd14c20ec34ce5ba0087b7f314f248dc7e6b57b61d9e77087313ef712382