Malicious PDF — malware analysis report

Static analysis result for SHA-256 35311a9ceb2b342e…

MALICIOUS

PDF

76.2 KB Created: 2021-02-11 06:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61ce6982f3d4f2eb00b7040b7b2f6492 SHA-1: c01a3f8031755853fa18eebda3174fb118894f14 SHA-256: 35311a9ceb2b342e543e9dce09378efd843339456785c3aba3fcb2b22447fb60
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=the+adventures+of+huckleberry+finn+pdf+free+download'. This URL is presented as a download link for a book, indicating a phishing or scam attempt. The presence of a large number of embedded links, many pointing to S3 buckets and other benign-looking PDFs, suggests a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+adventures+of+huckleberry+finn+pdf+free+download In PDF document text
    • http://hurricane1.space/ak_pembe_aknt_adet_iaretisizzfkw.pdfIn PDF document text
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/wuwadojumu.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/kzjdRZX/nomebutugikow.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/fiahghi/how_did_you_learn_english_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/cnhdgcC/ice_blast_anime.pdfIn PDF document text
    • http://stickerrus.ru/chat_facebook_now8nz0n.pdfIn PDF document text
    • http://chempion.coffee/movegujizilizofe309x8.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/kizugokofo/30556904060.pdfIn PDF document text
    • http://fusuxitizubuka.epizy.com/altis_life_diamond_mining_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/dikevenewitezox.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/11739125159.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/66299263712.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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5532 bytes
SHA-256: e2d6ad763936ea7035dba7417578be5812973ee13c88be6feead440895af08d7
font_01_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 10472 bytes
SHA-256: b884b341c2bb39b9c46d6cab4351067e9387b3f3f544580382d03254a4914242
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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