Malicious PDF — malware analysis report

Static analysis result for SHA-256 af196a35f136c92c…

MALICIOUS

PDF

60.9 KB Created: 2020-12-19 11:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a0b37bacda042fd87d6f28bace139a31 SHA-1: ce88f1c5ae7177f5895d8376009f046fd3d2363d SHA-256: af196a35f136c92ce3f43a5c69447bb3daf6ac111c22b707eb7ad20b1d32d84e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, functioning as a link farm. One of the embedded URLs, https://gettraff.ru/aws?utm_term=esperanza+rising+quiz+answers, is identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gettraff.ru/aws?utm_term=esperanza+rising+quiz+answers In PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/264557d8bfb8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_5fd99a7aa654d.pdfIn PDF document text
    • https://sudesiresa.weebly.com/uploads/1/3/4/8/134881981/vemenu_devikonot_vopinej_wogedagez.pdfIn PDF document text
    • https://kipuveleg.weebly.com/uploads/1/3/4/8/134851645/jafilalix-wiwed.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/e015d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414868/normal_5fb5ce1a68f48.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/mesetut_wiwimisabafi_pediredi.pdfIn PDF document text
    • https://zabepufi.weebly.com/uploads/1/3/4/6/134681717/bofukozibewifir.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/8fdcc826-0dd8-4370-9326-743081a31c51/frozen_movie_script.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc673d711f6a41984abc1e0/t/5fcf04fb14319a51dc27e94d/1607402747964/iupui_last_day_of_classes_spring_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcefc464a3cc4058a337ce/1606217669032/wibiwetedalerop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcaa7c5e71df64d6bdd8f6/t/5fdcdb7c5a5f2646afa2e746/1608309630221/wazekusudubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f73ba2-911a-4ba9-8b39-0b94b442ea69/pineapple_apple_and_mint_juice.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_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 5180 bytes
SHA-256: fb1526906621ab4036b324607d40c42beed1588e2cba7d60c33a8f1739561dd8
font_01_sfnt_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 10288 bytes
SHA-256: 3108482362f5bd91ca2e0ce34221a811b9b57c1c421a088cb785bf8e6a5e23a3

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