Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7cb02fd8b602c4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 08:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0193ec76aeb24f559d550ad730d29856 SHA-1: b8b7fd99e150c5aeda4fd3187ecc11f6c3534030 SHA-256: 3b7cb02fd8b602c4b24f829d20e9d0ae40db54655c05f75dc93260f67c5140b8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. One prominent external URI, 'https://jumiwimov.ru/wix?keyword=larson+algebra+1+workbook+answers', indicates a lure to a potentially malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=larson+algebra+1+workbook+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fef4deb0ebee.pdfIn PDF document text
    • https://belatefa.weebly.com/uploads/1/3/0/7/130775380/1913678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5fd11d1ba5752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_602d63dfda572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_6028724cc981d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_60334445e6b6e.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/3e7b4f69a782307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470964/normal_5fce014b31833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_602fb733eb829.pdfIn PDF document text
    • http://vejofewi.iblogger.org/bomb_squad_mod_apk_unlocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_6026fd0d82bfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6024ac0639944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_602df48d9e1ba.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/dojonuta/18798782451.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/nursing_scope_and_standards_of_practice_third_edition_2015_apa_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/39453461948.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/jesus_loves_me_sheet_music_piano_free.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/2006_honda_civic_ex_sedan_front_bumper.pdfIn PDF document text
    • http://pivujumurabaf.epizy.com/diwezanutumexozegizum.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5140 bytes
SHA-256: 669f21fd302d83e0d39cc04bd3a579b076eac81bfd751709aa4eea830d569616
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 15016 bytes
SHA-256: 703eb21412ee77d2e47ab70a4271b6538f3dcf6d78992ab776c398de4cf88663

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