Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f8bf544b56840…

MALICIOUS

PDF

126.9 KB Created: 2021-05-30 07:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4e194a33d925d6911a9f4ebc66b880 SHA-1: 5fa294e0e689508126208f1fdd824863bd645d57 SHA-256: 191f8bf544b568405005c07bef8491f55304e8dc203e872086c142b187262185
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to viewing Facebook profiles. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded links and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to generate traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=who+viewed+my+facebook+profile+premium+apk
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6036d5aa12334.pdf
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5fedd48d47c64.pdf
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6020345c11700.pdf
    • https://static.s123-cdn-static-d.com/uploads/4454820/normal_60b004ff13560.pdf
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/xanobogisubiratodo.pdf
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff278e1afcd4.pdf
    • https://cdn-cms.f-static.net/uploads/4477877/normal_606e5674e18ba.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_6058d23f663db.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_601117a935975.pdf
    • https://cdn-cms.f-static.net/uploads/4459175/normal_603b9b414a446.pdf
    • https://cdn-cms.f-static.net/uploads/4403951/normal_604f53c91d41d.pdf
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601bb527d857a.pdf
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5fedf8b816449.pdf
    • https://nevetutofipodel.weebly.com/uploads/1/3/4/6/134600430/3804311.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600b3f857e18f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/55031b2e-4103-46da-be29-892c3bd04800/5629886023.pdf
    • https://uploads.strikinglycdn.com/files/81ae3b7a-985f-4bb0-be20-c73297a38f5d/36587702119.pdf
    • https://uploads.strikinglycdn.com/files/218fc383-96a3-4711-84a6-b2df498954f4/50752617873.pdf
    • https://uploads.strikinglycdn.com/files/e9883db8-d11d-475e-9af9-b443fd829bc3/xugaxexabokotafowuji.pdf
    • https://uploads.strikinglycdn.com/files/45970fd5-6035-4ce2-87d1-da578680203c/zupoxajimuvifekab.pdf
    • https://uploads.strikinglycdn.com/files/8de0f92f-286d-4825-a06e-0765c3634fbe/zazufonenineduritevileku.pdf
    • https://uploads.strikinglycdn.com/files/8d62c1f3-9fb3-4913-b8c8-f301e37af7b8/timuwopetu.pdf
    • https://uploads.strikinglycdn.com/files/6eb78600-c273-4d6d-bdb6-306bdf00e42c/9787828768.pdf
    • https://uploads.strikinglycdn.com/files/5984288c-f325-4d5e-8fb0-4aabec0cdadb/intellij_idea_hotkeys_cheat_sheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018901.bin
3d9857494c9b827f3d35cd8840a1173434b0af00b6580f0fe079376fdd61bfd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x18901 8724 bytes
font_01_sfnt_off0001a4d7.bin
7c4b2a0d3046d4b24cb55904f82d277b1f508a04fefb1053f7f4c69eafe7e6e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D7 5384 bytes
font_02_sfnt_off0001b73f.bin
b8ee8b51f8a5deb766c208db3a128e5da7ca912a7a002d532c154108be45024b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B73F 11784 bytes
font_03_sfnt_off0001df57.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF57 4324 bytes