Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72013110987b57a…

MALICIOUS

PDF

87.2 KB Created: 2021-03-04 20:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cd5005ece319b5d2919cc04c2094866 SHA-1: 83c3d90828c7e75e86470a28f80c9a35abfc8a66 SHA-256: d72013110987b57a7019c783bb2f5366a761cce74d9413f1be93a735dd4dcdce
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=calvatia+gigantea+cultivation
    • http://lnstagramverifiedbadge-form.com/90112308211s256e.pdf
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60161988879ca.pdf
    • http://copyrightsupport-ig.com/woodturning_cut_paint_shop1barm.pdf
    • https://juvarefuj.weebly.com/uploads/1/3/1/3/131398009/98a547.pdf
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/7342042.pdf
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/xulew-pogobuwebolajub-zarejaj-vofuvodi.pdf
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fdd5edbd6f6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_7e62ade29d74444aadd67729a2c3b26e.pdf?index=true
    • https://s3.amazonaws.com/rimepusox/sugevaforesokoje.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_a222c1133a144c389e1d02647a0705d2.pdf?index=true
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_039a21508f1d42d8a4e61bf03dde59d2.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_4128ff057afa4923a972bbf0313fba2f.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_bd5137349d9a461d8851e86fa1a06f0c.pdf?index=true
    • https://s3.amazonaws.com/dumupa/medotuxijujefaxudafuk.pdf
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_f5badfa935c841d0b51e70923216ad53.pdf?index=true
    • https://s3.amazonaws.com/wupuxus/spaghetti_in_a_hot_dog_bun_discussion_questions.pdf
    • https://s3.amazonaws.com/divexikav/guvegilu.pdf
    • https://s3.amazonaws.com/popisiburewixuj/trumpet_instrumental_music.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_off00011b3f.bin
ad8446645653cf0150faaddab559d3fff371fffcfe9e35637a87d07cc3fc1ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 4660 bytes
font_01_sfnt_off00012b37.bin
881e5f9c9a683863b404f59e0ceb1510e105928f7a882e328c537ea745924c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 10756 bytes

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