Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bc340c118e38ca…

MALICIOUS

PDF

75.0 KB Created: 2021-04-03 11:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c44d84801a9c185b90d08a76eb7a7e89 SHA-1: 22591e2512dfcce19368c2d2f316a62a9af356d5 SHA-256: a2bc340c118e38cadc0fe9b5b654719bcbb995002c18987d2f74b44b68383de5
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 hosted on disposable domains, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://druttle.ru/123?utm_term=corrugated+plastic+sheet+b%2526+q PDF link annotation
    • https://cdn.sqhk.co/nepasibuta/hhjeihM/89440717513.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/NxXR5gi/nios_12th_admit_card.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/1OzYVji/endless_space_2_beginners_guide_2018.pdfIn PDF document text
    • https://wakukorukizine.weebly.com/uploads/1/3/2/7/132712206/figiwakonososag.pdfIn PDF document text
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/sirupoxis_zoxavumarejux.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/IKzXjj8/7655267322.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/g4giKjj/sezutofuf.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/ielmif9/91698907211.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gflbzUI/yoga_108_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/qiijgia/protect_defense_tank_attack_mod.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/fupirutufa.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/gggjhia/95528250519.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/xiijeig/frog_jumping_contest_hannibal_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/weridosotuk/EXyiegh/sonoma_weather_report.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/gljjbhc/most_runs_in_one_calendar_year_in_test.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/gapuruxumeg/nekibuwawutiboxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/casio_exilim_ex-s20.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_45aa45270c884e73aa9683dd1fb0428d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rotowan/81157167134.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_ac5e50de72e44ffabebd6e29a9bec8a2.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_9691d76083fc4981bd8f92f6149b44ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/lcci_level_1_question_and_answer_2017.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_c5d136b666f9455896617db2a23fdac4.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_b83fb3414d8f43d09e4a3d8cc2bb33ef.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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 4064 bytes
SHA-256: 95adddd4fa153fe50b98fce6c3a20b44b5c19e943726d0c607458aadbe6fc09e
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10500 bytes
SHA-256: 5c134290bd983fa80748a22366317d4c06d280669e91f576097bffa0592d57cf