Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a8dd54f99b019…

MALICIOUS

PDF

83.6 KB Created: 2021-02-27 18:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00c4d4ff69f522a2a81978698857790a SHA-1: 3ad6bd7e61ab68ea6bafc54d7d29c46f771995c8 SHA-256: fe6a8dd54f99b019882a444154e22146fceef09bc1fc0cb3ec9d792fe9bf6bea
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, indicating a phishing attempt. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=human+body+systems+worksheets+middle+school+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390381/normal_603000d4e5040.pdfIn PDF document text
    • http://7lessons.space/ionization_energy_trend_worksheet_3_answers9qq0w.pdfIn PDF document text
    • http://romeital.space/fegufixomirenataxv0rdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_60280ff134835.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/2073225.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/261637137971xsv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_60300d811679c.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/gejhiJM/train_simulator_dinosaur_park_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_602187b7ba5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_602c21f4b5615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_602d79dfd0da8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fe10b6484683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_60256ca88258c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xupovobejanam/4796166782.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/84725823522.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/40201109896.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 5636 bytes
SHA-256: 4f34471afb87b02c5385d2ed5597b6066d7b111fb5132941737cd6115144f5d3
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10436 bytes
SHA-256: 955e5d21bf667f5b10a7355f3faf8a83d21767040abb899fbc3feb45e83f1754
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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