Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83881844e323757…

MALICIOUS

PDF

86.7 KB Created: 2021-02-27 06:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35701722842eda189dbca05acbd12078 SHA-1: 87ac0c1280c3d9beb629fef457613369926787d0 SHA-256: d83881844e323757d6eea2b06a788f0a3240c9125f909c874519d48e922cc16b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to search queries and awards, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/award?keyword=what+is+the+natural+movement+of+air PDF link annotation
    • https://cdn.sqhk.co/daposofoxig/XuijTjc/57338029133.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/yhdhgge/escape_plan_3_prison.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_600b651816e30.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/fudofodakotozun.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/iEjijEH/83824966521.pdfIn PDF document text
    • http://marketop.club/proportions_of_the_human_body_worksheetq2xvu.pdfIn PDF document text
    • http://gramnews.xyz/mercruiser_service_manual_30ifngt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_6022613624cd5.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/h3heihL/83876347152.pdfIn PDF document text
    • http://xidijisuf.22web.org/what_genre_is_maximum_ride.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff38e3c096b8.pdfIn PDF document text
    • http://allrecipes.pro/356328800558ul73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5feb2565185a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5fd26d1f25651.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/difigomisosak/news_reporter_contact_number_gorakhpur.pdfIn PDF document text
    • http://pibusobi.epizy.com/41738817919.pdfIn PDF document text
    • http://kifemulawej.epizy.com/38304247205.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/android_wear_google_assistant_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/122577716.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_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 5080 bytes
SHA-256: 48f230d48f82445ed52535b1689dbd23921dcddaf42314fba9ada5435f68bd3b
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 10452 bytes
SHA-256: b2857ef1e593add5d1dcc73f151d1b188e61ae965c3bacb48787b984976d0e03

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