Malicious PDF — malware analysis report

Static analysis result for SHA-256 80df6b00eb7c7086…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 03:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d71847fca109819fbdc04ea1afc35eec SHA-1: b578fd9f8df025a357e0c43fe8001369434e6fdb SHA-256: 80df6b00eb7c70866665f8ce8514211c2b9b26cd345a3e0083fca24fbb77b800
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL `https://bologen.ru/wix?keyword=soil+texture+diagram+worksheet+answer+key` suggests a phishing or malware distribution lure, disguised as a worksheet answer key. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/wix?keyword=soil+texture+diagram+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5fe22e6e733fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_60462978c25d5.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/2144039.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/calibration_standards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_6002df315991a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60317f1b91e0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5feb0ab881b9d.pdfIn PDF document text
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/ladaguzejip.pdfIn PDF document text
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/4978642.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/6699819.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/pewibim/xepox.pdfIn PDF document text
    • http://bomajada.epizy.com/lovog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774f7430-d909-4f9c-89af-fc947e301a87/devils_bible_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/5222991122.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/61638770014.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/47934676497.pdfIn PDF document text
    • http://nafaloputazesoj.rf.gd/aha_bls_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/36507809171.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_ed4c01e48324467b954e9829da7b33a2.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_3130e5d151564840b87a2dd0fec5229a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f411827-029a-480d-ad94-c7d6d13bb177/nerepegikoxojejulomol.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/43643254522.pdfIn PDF document text
    • http://figejadinopi.rf.gd/does_dividend_affect_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cedf17e-dcf2-44d2-b3a4-5f50dd092ce7/mazunamizajifajojuwa.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5668 bytes
SHA-256: 6dd8b06193dfee32e70763651c8ac39b4bfaeb79b66b8925bce914d0c16099ed
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10192 bytes
SHA-256: 275cb3285f3bc22acb10186d4280f530f98c77048d21cc6a10058c9cfd298dcc

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