Malicious PDF — malware analysis report

Static analysis result for SHA-256 8232911ff82efb71…

MALICIOUS

PDF

41.7 KB Created: 2020-10-27 03:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: afc3d0dc3ca54af3447201ab1856b416 SHA-1: c2ea58e848309ce728063cbc21ad17d0df75f8c1 SHA-256: 8232911ff82efb710efe78f1f9684ab8d25cf84c6f1ae5dac40ef1a7eb8aa6e0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'sample cv for accountant pdf'. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/wb?keyword=sample%20cv%20for%20accountant%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5f9543f1c3133.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/5f7ba.pdfIn PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/tibot.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/bolerakilimak.pdfIn PDF document text
    • https://kejedaxuz.weebly.com/uploads/1/3/4/3/134355680/birunumatubemug.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/28397caff1f.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/293363ac8.pdfIn PDF document text
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/fitizaxab_fakuseni_gexudivifufiwug_xexadubimuveli.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/napejaxosinages/antonyms_list_with_hindi_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/bodirunamipoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/adverb_and_adjective_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/saviper.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/anemia_de_fanconi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9461/5238/files/engineering_mathematics_np_bali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1443/7033/files/61852780604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7197/4823/files/rileminixipudurexononu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641969e4-3777-46df-b581-adda2f949dd1/crescendo_book_amy_weiss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ef3297-9fb5-427d-bed3-4164f3602470/10399058602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26947d86-6536-44bf-ba2b-07f02fa42e8e/trojan_war_worksheet.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_off0000652d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 5284 bytes
SHA-256: d1c19cc8017ea1bd94694075ec71813da624d8d47f2b7816a0895903e697eaf7
font_01_sfnt_off00007715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7715 10128 bytes
SHA-256: 2ecc70f995dd48d13317bac2e8d942bb2d75f4dbaf26617f21b49a18dda25ad4

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