Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0bee4b6dbe80f2…

MALICIOUS

PDF

70.9 KB Created: 2020-11-23 22:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a3b56b206ad4adb304db85299740fb SHA-1: e31c5902d37e076a860e336fcf53cde883ee061a SHA-256: 8f0bee4b6dbe80f25d28fcf89d27c1e8d68f4fea5c9ef95154e77db1f6970be4
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying a link to a known malicious redirector at 'https://traffmen.ru/strik?utm_term=new+balance+outlet+store+st+louis'. Another critical heuristic indicates the PDF acts as a link farm, containing numerous external links, including one to 'https://s3.amazonaws.com/jixerubowi/pedasukejazeviwirat.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=new+balance+outlet+store+st+louis
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5fabfa0c49641.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8e348d9ec52.pdf
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/telujefun_paxipogolawulun_xatepamujexepaw.pdf
    • https://fafofezun.weebly.com/uploads/1/3/4/3/134338513/nakipigakazus-xufozafi-gafigotuk-fuxojo.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f8aa98ba193a.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f926d1f92e1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jixerubowi/pedasukejazeviwirat.pdf
    • https://s3.amazonaws.com/zalisujezajaje/jopoju.pdf
    • https://s3.amazonaws.com/falufusu/black_tie_formalwear.pdf
    • https://uploads.strikinglycdn.com/files/b1029a8c-0db5-4f13-9368-44b3d660d883/7621946037.pdf
    • https://s3.amazonaws.com/vikukinumet/8732424352.pdf
    • https://s3.amazonaws.com/zuguvoxoki/cloudtail_and_brightheart_fanfiction.pdf
    • https://uploads.strikinglycdn.com/files/c17d399a-c3f2-4c9c-8906-01206a45e91c/palm_beach_group_investment_of_the_decade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d726.bin
f3ec2e31083f095621852b17be6ece63316939c1628e969fd196afdcc2296865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 4992 bytes
font_01_sfnt_off0000e845.bin
70138fad993ab243b4f5f638f83019130d94d2bc060592a9898b88c8e6f4d0bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 11336 bytes

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