Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b580b3d4a6d62a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 10:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e99314103fa01bab4e8d049031a603ec SHA-1: 4a08ded9434406db5c8979ff97d34ddd56d8d1e9 SHA-256: 57b580b3d4a6d62ac472a10a1db92a4d87eed4fe57ced92e331a1bb0475ff0ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://fokemale.ru/strik?utm_term=craftsman+8+gallon+wet+dry+vac+parts PDF link annotation
    • http://lufosopaxukil.getenjoyment.net/digigimija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fca2c6671bc5.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/brukner_and_khan_5th_edition_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471946/normal_5ffd41106c0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_6044982e2969b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_602c3709aed1f.pdfIn PDF document text
    • https://vifunufuwo.weebly.com/uploads/1/3/4/5/134596702/746905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6045bc4b74db6.pdfIn PDF document text
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/lopurazulew-zuvesekadurop-lapup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fe1cbffb968c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzubosumewuxem.epizy.com/podekifupasevudakonoliba.pdfIn PDF document text
    • http://veboxin.epizy.com/habitually_chic_gift_guide.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/mathematical_statistics_jun_shao.pdfIn PDF document text
    • http://kudogal.rf.gd/50_examples_of_collective_nouns.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/63968349988.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/google_spreadsheets_wrap_text.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/72271969547.pdfIn PDF document text
    • http://nigugolesaxof.rf.gd/webpack_loader_html_template.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_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 5828 bytes
SHA-256: 9e6273ffc28fc169179edd6f7ba33968172e224b95dc5aef275612d087cbcfcc
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10428 bytes
SHA-256: 4aaff3463980499f42e2af710002a940025aa1c02f2fd04d42cf90d3e5532e3e

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