Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aea83f653a5ff3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 15:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eec4d9396258dd3b33e1809b83858274 SHA-1: 449a71b853712f1621607c4a790ae861b211313f SHA-256: 21aea83f653a5ff383be06284f38ac0afaa27b38be9fa9fe55c41ca82bf0f8c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://nipisod.ru/strik?utm_term=a+new+pair+of+glasses+chuck+c+book`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as `Pdf.Phishing.Trojan` further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=a+new+pair+of+glasses+chuck+c+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417986/normal_602f80dcd2237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_601da1bd9ef0f.pdfIn PDF document text
    • http://lenulari.mypressonline.com/24118641536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_60342d588fab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_60058f7839f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd97b5d65b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_600d9329b0d7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5ff5e49f61dfc.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/dell_optiplex_gx280_drivers_windows_vista.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/lotekokifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxapowi.myartsonline.com/vamabuzexiwubob.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_8b577b13e47546d9a6bf0d86df6fafb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77035389-109b-4ae9-be49-a4c6fe568585/dejasiluxa.pdfIn PDF document text
    • http://rodukamofuf.epizy.com/wood_gun_cabinet_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fecc0e-6b73-43f1-8a20-043b1963de43/how_to_audition_for_harry_potter_and_the_cursed_child.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_c5a45ceec1564d438ca9e80e1d3c698a.pdf?index=trueIn PDF document text
    • http://positajugopisu.myartsonline.com/xorujubaxu.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_021e15fcee7f4046acb057adb2db7e67.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_d7d7354f01d14b0499952ff62f2fa737.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5564 bytes
SHA-256: 0f365f972c057c2dda6d3daab563365e371fc558847cbbc35a9f3bbc9af169a7
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 11724 bytes
SHA-256: 98aa90ed538e07951f5cb032d46639090d6f587f59b394b50e6a46263d0dcbba

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