Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8121c1b2a9069c…

MALICIOUS

PDF

79.3 KB Created: 2021-01-06 09:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9ff8a31bf12b2e5ce8055d8019a3f1a0 SHA-1: d4c0257452243e553a849f845909071d93ee5577 SHA-256: 5e8121c1b2a9069c2af759a231b3cb2668f2365417837238da0b55f3375c0afc
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 heuristics indicating malicious redirection and a link farm, specifically pointing to a redirector URL that appears to be used for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URLs and heuristic firings suggest the document's primary purpose is to redirect users to malicious infrastructure.

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/aws?utm_term=acura+tlx+performance+0-+60 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fdd485524cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fbc1fffef9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5f9cf1436a9f4.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/fe095650b5f7.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/wegemebufojafak/footprints_without_feet_question_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6c3c67-7b31-42fc-b5c4-d59f98005b9b/balujapedefilafuxefa.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/pijenomepabijeviridubuloj.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/jesitewasofo.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/gusekamugemapabemubeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1c1287-dc70-4836-bc5e-7782978f2e01/bapoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/journey_to_the_past_duet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/careless_whisper_sheet_piano.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5368 bytes
SHA-256: 8e5f31ca4227792ac37d249d440f7254f0e83ec0029b2c93998b391ea6491520
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 10580 bytes
SHA-256: dc202e281f7aa70491b88daba09442572cf32b86f64982b0510891bbc2752475

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