Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aea0db2967fee93…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 08:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 246ab2cc5b80123e8c59f909cdd04c24 SHA-1: 3896f19d8f2b72bf3dc0f1e721bc12de8bfe7d82 SHA-256: 4aea0db2967fee93ed215995c578dab3b91963fa3fe9f2b0b204915d1719d0aa
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/123?utm_term=star+wars+before+the+awakening+audiobook PDF link annotation
    • http://f13x.xyz/parirutnd4hf.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/manual_cigarette_rolling_machine0ft5i.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/8817014.pdfIn PDF document text
    • http://thelandofbadideas.com/madosubebogutukuxazawolog4qno.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/5702394911.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/b26332d378d9.pdfIn PDF document text
    • http://wildboost.club/fundamental_forces_worksheet_answerswp1i5.pdfIn PDF document text
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/lanifanul_bokawopaxegube_porip.pdfIn PDF document text
    • http://originalhallyu.com/followers_pumper_mod_apkw8tzn.pdfIn PDF document text
    • http://belkwigs.com/mugejalmxp8.pdfIn PDF document text
    • http://rollernefritmassage.xyz/2868789687t8a0.pdfIn PDF document text
    • https://pusuwane.weebly.com/uploads/1/3/5/3/135346572/podaduweser.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/bugera_v22_head_reviewpsy09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/abcd_2013_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/18078411916.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/best_remington_700_stock_upgrade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 5536 bytes
SHA-256: 3ddcbd053e0dcdcb9217a12eb4ef08c74ecf4f12f94ecac1c2a85643019e5898
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 11176 bytes
SHA-256: 23369e8a6f814ab9df0fb150d69f84569049b439c3a0b01dedb8668436836d4b

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