Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afc0bbc77cbc652…

MALICIOUS

PDF

75.1 KB Created: 2020-12-07 14:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5d6f50e8850e3fc58c399ac72ba6f065 SHA-1: 560123c95441cd77ed6a26280cc6b7de846725e9 SHA-256: 5afc0bbc77cbc652bc075d76971fa9c4b446ee631c55f1d59a191ced12801e23
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of numerous external links and the link farm heuristic point towards an attempt to manipulate search engine results or lead users to malicious sites.

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://traffset.ru/strik?utm_term=ideal+gas+law+review+worksheet+answers PDF link annotation
    • https://dironirodog.weebly.com/uploads/1/3/4/7/134760169/betibe.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/7777bbb67f.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/8572983.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/metutakis.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/2463763d8f.pdfIn PDF document text
    • https://jawokipuroz.weebly.com/uploads/1/3/4/2/134265350/2713542.pdfIn PDF document text
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/biduvivu-gufuvibabun.pdfIn PDF document text
    • http://www.crestwoodschools.org/userfiles/867/Classes/9260/12%20In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/xeveruloxabisosida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1ed53b-3e97-4aef-b8b2-f44d165a8538/titapafawofivekija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f52690-2ce6-4b85-917e-147c4ad378a4/diffusion_in_cells_worksheet_vba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f0f6f7cf8c7540383d7d/t/5fc7c50d48d5672cfb4c476b/1606927634128/maxpreps_softball_missouri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529a6109-33c3-49ae-ac22-10d0dd9b861c/zefeduruxepivotajemevet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f67ca26-3da5-483d-8d91-aededc8cdfab/bevawidufan.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/gifuturamazoneme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b578f8e2-69ab-4d91-bc17-e3f1cd2b4738/26631115505.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc293fe0b6b03258f403ad0/t/5fcb9cf58dcc5603bef78c7a/1607179509850/osm_guide_tactics.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 5240 bytes
SHA-256: 5880eef8b658baf758eb3bd0850725cbb918f6c92dee2ead141c3fa99292ceb5
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 15344 bytes
SHA-256: dfc17d8252de4bdb17f2351a228bf5c975f7180674b880e1eaaacb2354a9ceb2