Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b1b3d58fbb83b0…

MALICIOUS

PDF

76.2 KB Created: 2020-12-28 08:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 00bbfd610041b8372319984ff8f79d2c SHA-1: 7c8405a04ced6c33e9b7660e710b4f053d1d08dc SHA-256: 94b1b3d58fbb83b0c81a222ec2b528dbfcb21d1eb2bdadf5bafd1bf2862edcf7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further payloads. The presence of a 'utm_term' parameter in one URL indicates potential tracking or campaign-specific redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=iodometric+titration+viva+questions+and+answers PDF link annotation
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/f07c57ed.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/ecfb246641d.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/758385b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f9a67d868f3e.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/1163331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5fc9dd0201f48.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/2bhcuge/white_noise_generator_program.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/kivun_nasif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fdc1fcdbbcbe.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/bubisifapagefe/avi_decoder_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547302ba-619b-49d6-8b98-2bae8f43e475/54046012602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4aef1b3-6e85-4472-af60-13173c1deded/tech_news_website_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28561a73-e858-4266-a440-50870e30bb37/73115328508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2731fa14-9b34-4622-963b-50cbc655c411/eso_witches_festival_2019_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/3496906119.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5268 bytes
SHA-256: e5e5c86735c12e02f9d9f2e10e132b2979d055165b4ab6b71f4d5063a3f682f2
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10900 bytes
SHA-256: 404df32fb7af67ec3d0853d49b3c716fe64bc0bdcd7e761eddbbacca11b1b742

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