Malicious PDF — malware analysis report

Static analysis result for SHA-256 acffee4ffc6db2f1…

MALICIOUS

PDF

60.6 KB Created: 2020-11-13 17:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ad1d65ffa89b4c743125a635c58aabdc SHA-1: e5ab8dbf4e3614bf92ce5b5d270f9623731870bd SHA-256: acffee4ffc6db2f16d42637242e862ccb2bb905377a6de3743d7dbe600dfa024
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO spam. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafficel.ru/123?utm_term=proving+parallel+lines+worksheet+answers PDF link annotation
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/1066686.pdfIn PDF document text
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/1931290.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/patixovoxoxig.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/4288893.pdfIn PDF document text
    • https://jujarodi.weebly.com/uploads/1/3/4/5/134507231/8346492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f93561bf18cb.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bfab2dd7-7196-4a0b-bd8c-32cf4154a971/how_to_use_wahl_eyebrow_trim_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac5f018-4d71-4dbe-9159-9118d0491949/86148025874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205c6777-2746-4a58-84d4-4602d6b56806/professor_messer_220-_902_course_not.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA82D 5088 bytes
SHA-256: b435ff9532e43a6cf6e0b3f520db842552466a2e246eb81d6e050ae6f4783440
font_01_sfnt_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 8864 bytes
SHA-256: 44a31013c9387847c3fed2283007e6c99ce8bd0fc1042b93f49a558f852bd462
font_02_sfnt_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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