Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad00027964bf873…

MALICIOUS

PDF

67.5 KB Created: 2021-01-18 01:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1db489338ab77445b9cbb253c1cdea21 SHA-1: 87a00109899576ffa577a264fc6bbff435e26536 SHA-256: 1ad00027964bf8735d840ea5b85cf84126ada56cf41a454f5dc945c1de8750ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains and potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to other sites. No scripts were extracted, but the overall pattern points to a malicious document intended to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafffe.ru/123?utm_term=sub+hand+receipt+holder+memorandum+of+understanding PDF link annotation
    • https://site-1188839.mozfiles.com/files/1188839/tamipexafazinusadejijudan.pdfIn PDF document text
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/4458204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_5fb35eab1573d.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/N3sjfje/world_cup_2014_game_penalty_shootout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_5fd727d5d8b19.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/gg5ie1W/bts_gestion_de_pme_alternance.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/cc1c656980.pdfIn PDF document text
    • https://site-1179441.mozfiles.com/files/1179441/97489025259.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hebgfDq/fuvizukusobujapalajapimex.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/PhbPGhe/little_alchemist_best_combo_cards.pdfIn PDF document text
    • https://site-1172792.mozfiles.com/files/1172792/54930553582.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/Fjew33g/days_of_decay_android_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ffa17c7d2c17.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/eiclOgd/video_game_wallpapers_mobile_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/74ighbX/maruzafidewamodumepuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fcf3be5cb0b5.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/tuletivotarupu/tout_savoir_sur_l_agronomie.pdfIn PDF document text
    • https://s3.amazonaws.com/juzerilem/gurafukanaropawut.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/62318458946.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/grade_10_chemistry_textbook.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_off0000ca1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 5812 bytes
SHA-256: e74831d66083d3251f7601f0833ce018edaf395d6523a71835e9e2b548c6ce59
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10160 bytes
SHA-256: 0a789d6abc129e857e7b99fc4893e53ba47b71cb7d28edbcaace03c2b059b5f6

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