Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb638df0a5ca39cc…

MALICIOUS

PDF

73.0 KB Created: 2021-03-30 14:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d16abcb0c21c26527ca4872bc0f8ff03 SHA-1: 554409feee1c01999efcd12b8ce8927df8b4c68a SHA-256: bb638df0a5ca39cc74c6eb98b9dd6e8cee62502cf9df53015bec9b98ee4ce0e1
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/aws?utm_term=2019+amc+8+problems+and+answers PDF link annotation
    • http://reduslim-shop.site/free_full_nancy_drew_games_onlinepxyou.pdfIn PDF document text
    • http://repair-monokoles.ru/mukawokiruzitubumirubewuz6bkyw.pdfIn PDF document text
    • http://oneplusonemain.xyz/stock_market_hours_tomorrow9mbpq.pdfIn PDF document text
    • http://zewegirugiputix.22web.org/66543873236.pdfIn PDF document text
    • http://summ-ita.space/adobe_2019_crack_mac_redditw1sb6.pdfIn PDF document text
    • http://nesobaka3.xyz/the_choice_nicholas_sparks_quotesvvs8j.pdfIn PDF document text
    • http://rekopeza.22web.org/rocket_league_cross_platform_online_play.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_9713db53a3e94f0485f8b81611072d9c.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_00003e18bc1d4d98a26425560368f82f.pdf?index=trueIn PDF document text
    • http://zejowupifodoj.rf.gd/internet_radio_recorder_apk.pdfIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_bce797759969469e8b3cb13330f3ac7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/dodge_avenger_2013_battery_light.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_b5b31ff1d4b44b2abe2f30bd0fb88ee6.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_19c0e9f8b73645d2823ffd17e08a3b76.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_8ba124f81a784124abb3412687bc6279.pdf?index=trueIn PDF document text
    • http://lamisegowa.epizy.com/astral_body_powell.pdfIn PDF document text
    • http://jujabezemaluwe.rf.gd/european_guidelines_helicobacter_pylori_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/25684223343.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/65185733106.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_a4e27802e275467595c16f89a1b9d9da.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_31bc158e90ff4b928e967fff9efe48f7.pdf?index=trueIn 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 6032 bytes
SHA-256: 4643905fa969bd9a5d63645feddb40b9407bc300c981206e28ac856b3831a4ec
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 11320 bytes
SHA-256: 767c76b36d0991234fd3ef857e81d0e423649b72cf3a63da031fa605b8b39c20

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