Malicious PDF — malware analysis report

Static analysis result for SHA-256 390b4e0d67bc3178…

MALICIOUS

PDF

64.5 KB Created: 2020-11-22 23:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 016beadced7c0ef3485326b5d2e9f73b SHA-1: 9878fed60cd9158b8801e4710b6713bfdfae3808 SHA-256: 390b4e0d67bc3178e00e23f497c6f157f90899485157ecd21e7bf3af8ccd2a3b
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/123?utm_term=kinematics+of+machines+notes In PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/meladuv-jawalutepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5fa00c699f472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f9b0e104298c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f951c161fbb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9faffe208d0.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/a524ba0e9d.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/aabca3c5af59.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/5003d5cbc57e5.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/tipij-belemajunevez-xalupirivega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8bb8ec77f0e.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/f32ee845-17b1-4cfc-808f-7db5239db68b/dragon_age_origins_arcane_warrior_gu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483ca3eb-b1c9-4434-a9bd-49604ad62745/ims_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/70672952695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e71803f-1501-4a15-bebe-444dbf385178/12695816092.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/walk_two_moons_answers.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_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 4964 bytes
SHA-256: 904f87103be6beeba4905095685f966bdf9266ee0ee5f1058539d18abf7237f4
font_01_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10588 bytes
SHA-256: d74e7cc8851f7499e9447a40d62828a4457c4b4479978ec7f4b63de12cf09c18

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