Malicious PDF — malware analysis report

Static analysis result for SHA-256 a069aa9c5bba2b99…

MALICIOUS

PDF

72.5 KB Created: 2021-03-04 22:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5053cb2a224189d24b59079756ae59b1 SHA-1: e5dff9e9978d0616146d38065e8fc5e0c59bbce7 SHA-256: a069aa9c5bba2b99f273074aa3b27468789a3dd499a09870fba59463097a8405
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs hosted on various platforms, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ponafet.ru/strik?utm_term=the+art+of+game+design+3rd+edition+download', appears to be a malicious redirect. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=the+art+of+game+design+3rd+edition+download
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/tagufabun.pdf
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/fazotabaxefudajojije.pdf
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/1837739.pdf
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/gamirasewaninesufe.pdf
    • https://wogefusupe.weebly.com/uploads/1/3/0/7/130740138/zesemebibomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6f76673-05cf-441a-a69f-df01eb6879f9/sig_sauer_sp2022_9mm_30rd_magazine.pdf
    • https://uploads.strikinglycdn.com/files/aad27e48-8d99-442d-9575-245508269996/19857505256.pdf
    • https://uploads.strikinglycdn.com/files/5836233e-7600-4092-9a11-d0107c1e2bfa/where_can_i_buy_fire_and_ice_condoms.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_c018f7c30aa642da9a7dd58dcadea4bb.pdf?index=true
    • https://s3.amazonaws.com/nolarifaforuxop/burrakatha_movie_telugu.pdf
    • https://uploads.strikinglycdn.com/files/ea982275-df89-423b-8d30-051501b04a6d/vifirutoruwepulo.pdf
    • https://s3.amazonaws.com/votuweroxigezog/template_pbd_bahasa_arab_tahun_1_2019.pdf
    • https://uploads.strikinglycdn.com/files/75b0c18d-bfc6-40ac-8b2c-1c519f29c137/18906417202.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_3085b1b4712d4b63863d0fcae0f72229.pdf?index=true
    • https://s3.amazonaws.com/kakekojezutok/lewupafuxinikem.pdf
    • https://s3.amazonaws.com/zinudipir/why_does_my_netflix_say_something_went_wrong_try_again_later.pdf
    • https://uploads.strikinglycdn.com/files/ce14dac5-9ced-48ee-9083-42109fde9a5a/36542482655.pdf
    • https://uploads.strikinglycdn.com/files/138a46c3-333b-4fad-bd87-03615a4608d7/62723149685.pdf
    • https://s3.amazonaws.com/luramamelolem/gimoxixemeribadas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin
9d64ce88c1457c16db90fde8acb35475310f4b22004c1f9cc3a7dfcc52e225f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 5524 bytes
font_01_sfnt_off0000ee3c.bin
a543105a074b5c1a5ea490c5a67981f12e5328425b618c4873ec1c709949200f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10764 bytes

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