Malicious PDF — malware analysis report

Static analysis result for SHA-256 3975c7500a754ddf…

MALICIOUS

PDF

73.8 KB Created: 2021-04-01 00:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4fc0ae2b5eaf6ea36e4100627bceb5f4 SHA-1: 28b19cd4315f80bb8ac44ecc3f165a9b9a55581e SHA-256: 3975c7500a754ddf239e3cad91f6a1a95cb74d9ce58f3e9be34664484cbe1cf9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'Google hangouts chat app' and 'wkhtmltopdf', indicating a potential social engineering pretext to drive users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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
  • 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://xezojetit.ru/123?utm_term=google+hangouts+chat+app PDF link annotation
    • http://meblik.su/94926310056w4t3q.pdfIn PDF document text
    • http://ersoil.fun/32255288558dux6l.pdfIn PDF document text
    • http://redpandarecycling.com/daminiketomimepelosrsrck.pdfIn PDF document text
    • http://instapriz24.site/vanaje0hrey.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/introductory_phonetics_and_phonology_of_english.pdfIn PDF document text
    • http://hydrofthol.space/videoder_old_versionrki50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_00b319a1aef34d5b955447ed20cf2abc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/best_atari_jaguar_emulator_for_android.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/64960794657.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/viwuxuxuwo.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_624b383a2312413d9ec4707da64602a8.pdf?index=trueIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_15a0e12eb5894107bc304ee88b575e72.pdf?index=trueIn PDF document text
    • http://puvapulugo.onlinewebshop.net/complex_sentences_exercise.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_8faeaf9c694d48ff955a77ff70df4753.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_656da5131a154d7f905270522ce9a6a9.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_15ee029c93ab433ca5b7dd872a7f6eca.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5128 bytes
SHA-256: 596df686d4a9393de84731b1afe68f76eafab5796eb17a44cab96b57c9722794
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10748 bytes
SHA-256: 2d3e7dad7ba7fe9d89f69a2b991314338a6d3616713664f4e31c14a32b3955bb

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