Malicious PDF — malware analysis report

Static analysis result for SHA-256 7492f1ff53cbc843…

MALICIOUS

PDF

79.8 KB Created: 2021-03-25 05:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26bbf65077dbfda4f9f1e2f7d20351e2 SHA-1: 1b5d0eda5853bfd8b06a40bda8cdfbdadccbc020 SHA-256: 7492f1ff53cbc84378ad5682f63f64e2a9515cc3c3c2e98952b6b702746f25d4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL with a 'utm_term' parameter suggesting a phishing lure. The document body, though heavily obfuscated, appears to be a distorted version of a book summary, likely intended to trick users into clicking the malicious links.

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://pelibifir.ru/aws?utm_term=robert+greene+mastery+summary
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5ffbc4d7d5073.pdf
    • http://pojibuvuj.mygamesonline.org/what_are_the_elements_of_art_with_definition.pdf
    • http://kufizuvepopes.22web.org/wedadivebenogazatisofap.pdf
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6019f470e14fa.pdf
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/860513214702.pdf
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/9660787.pdf
    • https://cdn-cms.f-static.net/uploads/4369936/normal_601ca67f6c9d6.pdf
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/geselim.pdf
    • https://zitewamim.weebly.com/uploads/1/3/1/4/131454986/769703758.pdf
    • http://lapegokexixij.medianewsonline.com/lubozagazurobi.pdf
    • https://cdn-cms.f-static.net/uploads/4484399/normal_60277aa551115.pdf
    • http://legobibeli.22web.org/15173287343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://febarufowit.epizy.com/nobapikewol.pdf
    • http://vuwepimu.epizy.com/67944274749.pdf
    • https://s3.amazonaws.com/nalifij/71265067502.pdf
    • http://lexalerov.rf.gd/31487665834.pdf
    • http://wemiwapava.epizy.com/z370_aorus_ultra_gaming_2._0_manual.pdf
    • https://s3.amazonaws.com/fedojigudaj/90449972015.pdf
    • http://xipusexikexi.epizy.com/chemistry_formula_free_download.pdf
    • http://jusekajuno.epizy.com/tobutanufebi.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_off0000fc04.bin
26b058f325ae503fafacd5e35fe53a5df8df1f869961dbfad7521b6c619de414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 5220 bytes
font_01_sfnt_off00010dbe.bin
1a5779de584fde2ea49c99130b56eb0c4e2f398ca7b5a044863e910fe413b15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 10572 bytes

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