Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae1752a06bd1beb…

MALICIOUS

PDF

75.8 KB Created: 2021-03-09 06:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2258db8fb1ad6f92b3a2bbb65bd8ff4f SHA-1: 9a50f8e899370f70a2d9488ee50505f0d586476b SHA-256: fae1752a06bd1beb5dd13e100a10058db22818e74eed489b1ddf8f1388923051
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags it as a brand-impersonation credential phishing lure, directing users to a redirector URL which likely leads to further malicious content. The presence of embedded URLs and the overall structure suggest an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jinumajot.weebly.com/uploads/1/3/1/4/131409926/74c627fc9efc3.pdf.
  • 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://fokemale.ru/wix?keyword=worksheet+direct+object+pronouns+spanish+answers PDF link annotation
    • http://clientesdkb.com/90812775185ilfid.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/jivja7q/solitaire_games_free_online_klondike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_60232b6e4e9af.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/j17gjij/61307454625.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/ggifrmn/80s_songs_without_music_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_6026f852c657d.pdfIn PDF document text
    • http://greatholl.com/55124730994iwk5m.pdfIn PDF document text
    • http://cheapkeys.site/kannada_movies_2017_mp4xmoce.pdfIn PDF document text
    • https://jinumajot.weebly.com/uploads/1/3/1/4/131409926/74c627fc9efc3.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/nusit.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/izgcR7d/pixel-_adventure_art_run_pixel_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_cd6eb2b20ca94db3879e107e1128bfd8.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_740d88265abd46dfb1a4845129008f9b.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_e9311e46945f453fa1f0aa7f300d53a5.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_0581312a00cc4fa3aedfc7348b45b1d2.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_e667ccebf91a4d8793ecd1358e1ad5db.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_6f43373f64f8416cb26aee994e055c1b.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f188cae502f8460dbf3f10b17f3212f5.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_b62fe34cf0ac43ad8b6a955afa4f49d4.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_cd1c3ba6f47b4cb2b5d42852fd986bcd.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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5512 bytes
SHA-256: b57c524f5235b172ca7fc1731faf6f2073afb1b146b4eb124d60b10280be46d5
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10992 bytes
SHA-256: 094d85d3ba463c3729c061be5e801e23a0f6cda2d1e67b83bf18f5dd9b120187

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