Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb045b0ca8a0e725…

MALICIOUS

PDF

85.9 KB Created: 2021-03-21 23:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d8501c9ea20c051f1a093d8196b685 SHA-1: 340460fe3c576a2ca6a286007d7875e9a45cb208 SHA-256: bb045b0ca8a0e725a819d73ddbdefb5c1b830fc8187134c71744012cd68242c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an external URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a phishing page or download further malicious content. The document body, though heavily obfuscated, suggests a lure related to tax reporting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=tax+exempt+accrued+interest+paid+reporting
    • https://static.s123-cdn-static.com/uploads/4460251/normal_5fc7757622f9f.pdf
    • http://vutisonoj.sportsontheweb.net/whirlpool_quiet_partner_3.pdf
    • https://cdn-cms.f-static.net/uploads/4376866/normal_604f645ad2c69.pdf
    • http://tapopapebesawu.getenjoyment.net/jakine.pdf
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5ffde1b2c2a80.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_601dc172d75b1.pdf
    • http://towexiwi.sportsontheweb.net/moral_dilemma_in_ethics.pdf
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fce4bfdf2a49.pdf
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/gajoz.pdf
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/kiziwabudebiwarox.pdf
    • https://pakajifovajopif.weebly.com/uploads/1/3/1/6/131607230/d36000c6b7727d.pdf
    • http://polobasopika.mywebcommunity.org/arcady_petrov_portugues.pdf
    • http://lukiduxipapep.mywebcommunity.org/fineluvenuwakagaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5966d766-3c89-41f8-be33-51d12438478f/how_long_to_cook_pork_on_slow_cooker.pdf
    • https://uploads.strikinglycdn.com/files/c794c6e8-b7a7-4940-8ade-8c595ccb6e6b/66391094657.pdf
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_276d07bfec9c431d99e3a4c861f06fc0.pdf?index=true
    • http://zatuvejamubolo.atwebpages.com/83199537723.pdf
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_edc48afdff654080ba7112c5b4d93287.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_c28e78d7a424466aa5d7bc677d2cc8b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f6ee04c-8f46-4985-9bff-f78eb0b21363/why_is_my_hayward_pool_heater_not_working.pdf
    • https://uploads.strikinglycdn.com/files/8c1b6236-229c-49a9-a9fe-cd2ac93ddb53/56547316086.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101dd.bin
a427748bfcfd35915914cd9bc939024a15fe941a9eb2f66fda59542878c62159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 5260 bytes
font_01_sfnt_off000113a8.bin
d61c992ab87242dd4b3032f0079d4e2555ccb350d82fec5c4f2d858ba2179597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 11148 bytes
font_02_sfnt_off000139c0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 4324 bytes

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