Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c76265d9074260a…

MALICIOUS

PDF

90.7 KB Created: 2021-04-12 13:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8f531c5d6b04c47e90a547fdb0d1e280 SHA-1: e787824e1b38c1f90ce44fa7a7ffc5fc2b677837 SHA-256: 4c76265d9074260a08e5c6651f677c5b154fba82d128d9f63c0b56a12ced3858
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely related to the 'how to remove maxi cosi mico ap cover' search term found in one of the URLs, suggesting a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=how+to+remove+maxi+cosi+mico+ap+cover In PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/gajawigigafok-gebikawu-guzositop-rolanu.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/buziluserusagazeve.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/5622305.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/282147746d233.pdfIn PDF document text
    • http://tronreserve.online/89418045584a055m.pdfIn PDF document text
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/mizapopekexav.pdfIn PDF document text
    • http://mysteps.online/linear_algebra_college_course_onlinejhzrt.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/1262073.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/murevukokujidopar.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/julejemu-jofidim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_d5df2a586869489aaf34fdac114fc66a.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_4c71836fcd93433394b8088fdd1cb12c.pdf?index=trueIn PDF document text
    • http://napipipazapuka.epizy.com/degigilivunopirafajadaj.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/konamizusejasomadulud.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/49489302482.pdfIn PDF document text
    • http://pekuvem.epizy.com/43306454663.pdfIn PDF document text
    • http://filanovedo.rf.gd/55691918015.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_89e6ab4f1b77429ab02eedf15f03eb04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/12280272108.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/weaver_dota_2_guide.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_da007d54a9594b87baef7ca13ac75b4d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 5228 bytes
SHA-256: c7f490d7e6a028da956ef303d66451b42681df1bf728cc4a11e1de980cd7b6d1
font_01_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 11516 bytes
SHA-256: ceef9ddbf41446ee0051bf7d5353487d35282668f4614eb119592a20f4974248

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