Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caebaaac9e85c63…

MALICIOUS

PDF

77.4 KB Created: 2021-05-23 10:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ebfec92ccbe833cbe3849ff6f9363e5b SHA-1: 04a489c222ff72aec0d00ef4e108d66469a8d57e SHA-256: 9caebaaac9e85c637340fb1ec8f18950ea30a2828f97764258e26834eb095f32
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or redirectors, suggesting a link farm or phishing operation. The primary URL points to a page related to fixing a Maytag washer, likely a lure to engage the user. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate malicious intent, possibly leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+fix+ul+code+on+maytag+washer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501201/normal_60339fca4721b.pdfIn PDF document text
    • https://nosujufan.weebly.com/uploads/1/3/1/0/131070407/7821256.pdfIn PDF document text
    • https://punopofogow.weebly.com/uploads/1/3/1/4/131437229/777f71dabdb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6020209d659bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd6d1aa88276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6013a3bf55ca4.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/3dc57bf5c05bf2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_6012bfd627ddd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ff81aae80a68.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/5813679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_5feb185563ddd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxexi/vonumomalibuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb39a11f-f7a2-4fc7-b130-98fdc0789039/63016865194.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/yahoo_answers_funny_molested.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63888c5-c1f4-4cd7-bad8-8fae845f564e/kalam_cosmological_argument_mohammed_hijab_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 5540 bytes
SHA-256: 74d6ac93492c1f39aa911e4744b91d50ea0fa1460bdc101c319680e5794716a4
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10968 bytes
SHA-256: 2844ae505a1179213262320ba412048c89246879457a59239c90b6379745069f
font_02_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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