Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c56cff59c315eb…

MALICIOUS

PDF

73.5 KB Created: 2021-04-02 19:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1365cc193e9178b28ddc55f193d63517 SHA-1: 2094dd9319d13db2a6d86d1f85cc3068f3d22168 SHA-256: 54c56cff59c315ebd01d96e78b084c9a3bbbbfb7e3436f893f14c8bfa7c485db
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The embedded document body, though heavily corrupted, contains a title related to making 'mumble rap', which is likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8823

Heuristics 5

  • 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
  • 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://lozipotod.ru/strik?utm_term=how+to+make+mumble+rap+in+1+minute PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414866/normal_60431236d6462.pdfIn PDF document text
    • http://raweloridewuwo.22web.org/wall_mount_for_emerson_32_inch_tv_lc320em2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_60348f59160a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_605c9ecf5b5f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_604169d14f70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_6049093cddf7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fee622fa4dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_602ab9e044f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_6039772b0a7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_60637d12525b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_0138a6957f91417bbd4b564d9f158c45.pdf?index=trueIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_6b52e3cc76f84550af6a94e70225f5c1.pdf?index=trueIn PDF document text
    • http://nofadokar.rf.gd/16234086373.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_0fe2ee894275494b930bea607b33b31a.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_f308028c3d624c269fea9854296bea4e.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_b6a9c31fbdea42d58cc51de4a765097a.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_7dce9d74a81a416e951a425ffc8d0b1d.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_2372d946f8af447d8ff88e165db4e995.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_74874ab19e4f475a91aa70b66ee6fb6f.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_0cfafdbcb3b24c9d9fd141f7a0e05064.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 5096 bytes
SHA-256: d98e1babbebbd3f0a1c4f4a2f380955653f08f1c92c1c367f0ff82aa77ff569e

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