Malicious PDF — malware analysis report

Static analysis result for SHA-256 4890272649e605f1…

MALICIOUS

PDF

75.7 KB Created: 2020-11-11 22:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 819aaf5fc09aca91a2d8c6bbe08bdc9d SHA-1: 10eca23fe069a10b7470daea022d0b5b0393b03c SHA-256: 4890272649e605f1403486a8b58977f41f33b80cbbaf5510db442c02bfbbca91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, with many pointing to disposable hosting services like Weebly, suggesting a link farm or SEO manipulation tactic. The presence of these links and the overall detection indicate the file is likely part of a phishing or malware distribution campaign.

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=best+high+thread+count+egyptian+cotton+sheets PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.pdfIn PDF document text
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/1456698.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/9625103.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/6871058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f890be3a0d1c.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/rotewar-ximixupamaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f910bdfa47e8.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/3237510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c77637-e8f0-4b32-b83d-eb1262e34b8f/resimokesefijok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31867cc5-1db3-4964-a766-682d460c555f/pefiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fab38a-c926-451b-a52e-1fc91a22e08e/dobulakolop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97369868-cded-4c1e-870a-91d2a2b6f8d5/2236955080.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5452 bytes
SHA-256: 59f4b3375bb30cc31fc5e11a7257dcfed81f82e78960ed5b69d84740f3cc8297
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 11104 bytes
SHA-256: 262251d72f1e2605a7a47bc50b1791ce95a492b4a0fce0816b35558af3bfb038

Open this report in the interactive analyzer, or submit your own file for analysis.