Malicious PDF — malware analysis report

Static analysis result for SHA-256 247c31de2e11017d…

MALICIOUS

PDF

81.3 KB Created: 2021-05-29 23:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 040391d2248145be2e40d94b067eccb6 SHA-1: 8112627190255dbed942e257f8594d73f268aa97 SHA-256: 247c31de2e11017d4ba8b18371fed20f304580106c90ab380dd36c5f681e3702
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The document body, though partially corrupted, suggests a lure related to changing a lock code. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

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://leonvi.ru/strik?utm_term=how+to+change+the+code+for+a+schlage+lock
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/fejepopefalixor_zejezoralax_musivo_karufapekanid.pdf
    • https://cdn-cms.f-static.net/uploads/4479213/normal_604d0ec3b3d17.pdf
    • https://mazifufozabi.weebly.com/uploads/1/3/4/6/134690202/5708936.pdf
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/vovobuledupo.pdf
    • https://static.s123-cdn-static.com/uploads/4366622/normal_5ff7fa2291eb2.pdf
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600fba89baefa.pdf
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/delepize.pdf
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/1708375.pdf
    • https://cdn-cms.f-static.net/uploads/4494440/normal_60202b0d2241f.pdf
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/vuturexedosewam_xodowopojumage.pdf
    • https://cdn-cms.f-static.net/uploads/4495860/normal_5fe8d8e3877f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d60fa8ab-bfc7-4803-9929-aa0ff94af34c/attack_on_titan_manga_season_4_coloured.pdf
    • https://uploads.strikinglycdn.com/files/2f2f051f-83d9-4589-9ed6-f6284d68b9fa/how_to_get_water_softener_in_apartment.pdf
    • https://uploads.strikinglycdn.com/files/58b03825-81af-4ba1-9c5f-615aa6dc8b43/kings_quest_iv_the_perils_of_rosella_remake.pdf
    • https://uploads.strikinglycdn.com/files/ea751a63-ea78-40fe-8d55-bed99ba35850/p90x_chest_and_back_full_video_dailymotion.pdf
    • https://uploads.strikinglycdn.com/files/28b7ca38-f760-42a6-b47b-4aeb383b84c4/nikon_n90s_manual_focus.pdf
    • https://uploads.strikinglycdn.com/files/8f28c2ab-b565-4647-9ddc-93db5089e5ab/90269603390.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin
0fd5babe68b7277d1970f1ab3380dc98abb83ff71868b738f57f92f16d3aae0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5140 bytes
font_01_sfnt_off00010464.bin
93d1f96cdbade61657445c402ca1f9a1d7e92f725d02aea055550c7ccfe52b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 11036 bytes
font_02_sfnt_off000129e9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 4324 bytes