Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea9913f08d00fb1…

MALICIOUS

PDF

68.5 KB Created: 2020-12-19 17:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5d64213194fd90b4dc22b63565e81d27 SHA-1: bac354831addbf9ff6954c97393fe36aae77144d SHA-256: 2ea9913f08d00fb1be7b1d23fb361b9dff8f26ad6c795306b10bb88d166858ee
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, 'https://trafficel.ru/aws?utm_term=autocad+2016++for+windows+8.+1', suggests a lure related to software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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/aws?utm_term=autocad+2016++for+windows+8.+1 PDF link annotation
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/6049b9f57e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9384e7acd8a.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/ketajirazebibiwak.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/pajukovuxetu/compass_group_plc_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/juvenile_court_counselor_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/98014010837.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/scert_btc_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/angular_6_datepicker_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87fc3c7-c65d-41f6-a677-92d5c43929ca/71045003043.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/11006845174.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/nizodatonevozikoja.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/du_speed_booster_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9289ceb9-b028-4656-aa60-dfd7a1d76072/the_big_book_of_brain_building_games.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 5768 bytes
SHA-256: c261186305daa568c03e355335e96297b84c4d9dd96b793853d7fd52cd86f3ba
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 15448 bytes
SHA-256: 08075d2ca8fa53fb680bcb9daf6d65977ce6bbd3548898cbeff8b53c2286701a

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