Malicious PDF — malware analysis report

Static analysis result for SHA-256 08627321b25f4af5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 23:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a150c477130e0328a50b80685218668c SHA-1: 447ef070709b0c32df79cba8933758e01c6d0bb2 SHA-256: 08627321b25f4af58ece44a8e91bd7858d2302a8a2fbd9153a1d02ccafb54ada
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to distribute or phish via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://soxebez.ru/aws?utm_term=el+caballo+de+troya+10+pdf+1
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/1788847.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/4404273.pdf
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/646b89a5858.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_104381c2bf524a84965dca5dcee75c8b.pdf?index=true
    • https://s3.amazonaws.com/gupawupigawono/10370755784.pdf
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_42eca6c4a35d402085b6ceca4051f51b.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_92448477edbd429d9bbc5bde375fed32.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_807f705048c44ffd817a870414cdaf60.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_fe3ada8fd88b4d18a7b0bbf61592ff59.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_ad47dd763a434c66b6e7dfb09bd43383.pdf?index=true
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_bc96c9c6e15049059dbce84c06b1b7e3.pdf?index=true
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_dead9569a11049768efe6aff2d1d39db.pdf?index=true
    • https://s3.amazonaws.com/wewiro/wigerowuzalesagaliligo.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_0aac3497a9914c11883bf566da5643b3.pdf?index=true
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_781d5eac21554f7e88f266bd2139b0f2.pdf?index=true
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_c870a71bda6b41689efc2d51368e11cd.pdf?index=true
    • https://s3.amazonaws.com/vuforewebub/kisanetadukefatuliw.pdf
    • https://s3.amazonaws.com/xanunafojuloki/sujuzajolepezewosujoku.pdf
    • https://s3.amazonaws.com/xijalovelokolep/nukejuzuv.pdf
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_6638646a3ee7448cbbbe13ade18a6b09.pdf?index=true
    • 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_off0000eaf4.bin
3c06296361131504dd519d6688c10100b63039c3d694624d97b0689f07a3c901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5364 bytes
font_01_sfnt_off0000fd49.bin
495d54f07b1781ce2f1c51792e79549a4ccbc9f9a7da21a0b1330d276c270696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 12220 bytes

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