Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff158529435756a7…

MALICIOUS

PDF

68.8 KB Created: 2020-11-11 04:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b5d0f075dc73f45ee0042cf13511c071 SHA-1: 2b034aa7d8d6c78f9f27bde365f34c3a8618a97f SHA-256: ff158529435756a765a059c7d4beb2e5bce4bd8f662566c27a14071596dbd240
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a large number of external PDF links ('PDF_SEO_LINK_FARM') indicate a phishing or scam attempt. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/123?keyword=portachere+on+homes+pictures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f9ee54000f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_5fa53b783f187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f9a49d47a9e3.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/e56e03bbde530a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f94b175430bd.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/0dd327af-1cf5-4c16-a2ea-fa00b81375ab/thermal_fuse_dryer_whirlpool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f707b90-0390-426c-ac5a-97faa36b12ed/97495754240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fbe2ca-a900-4b17-a044-32918dae4db2/luwebupunamovafezifa.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/ralemoriropan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323385f5-5b6d-46f4-b8c8-0d268200d1fc/73852294332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552b733f-a27a-4a41-ba7b-a71ae7da98cc/snap_circuit_instruction_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 5140 bytes
SHA-256: baa1f78e94cbf5ca0ef3eea16c28bf31d1f9a0a712f13c56bcb7a99cc9868bcf
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 2508 bytes
SHA-256: cf149429f5e0e9cad348580d405cd674f9976568e85d438475d003c058d04df4
font_02_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10624 bytes
SHA-256: a36db9df9467c503a88ba924c5f53d19f8b4a1e300aef8a50597f7ed242a6da5

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