Malicious PDF — malware analysis report

Static analysis result for SHA-256 af44de194424f7da…

MALICIOUS

PDF

84.0 KB Created: 2021-05-21 22:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b307a2903e90419c434b64b9801e94c2 SHA-1: cb3fe95bd644a2f8e8cb433c1fac916d2fdc7d76 SHA-256: af44de194424f7da52c79267c1da06c70ceb51f280eac0d36ca796a2868d8f09
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, with the primary one pointing to a page about the world's richest man, likely a lure for phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, possibly to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/strik?utm_term=who+is+the+richest+man+in+the+whole+world+today PDF link annotation
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/denagivavosus-mekano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_601f3b401b806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fe8136152bb7.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/9fc0d40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_605f87037b5da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fcbb460062b9.pdfIn PDF document text
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/somulonefulebupirano.pdfIn PDF document text
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/zajiriwekeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_602f6e2397d95.pdfIn PDF document text
    • https://buvowanux.weebly.com/uploads/1/3/4/6/134685119/nokud_tuvawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc4753b-ed3c-4b99-8535-b0a54c789e61/joruvenepotizubitusik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29646e1-77be-47aa-8489-e76a971c391d/rikisatuvoduboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7032d343-ea60-4791-bb9a-202ddfc6e71a/john_deere_x320_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc414de9-e087-4a04-b6ca-53361fe3f4f1/10720090059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6ba260-6b09-42dd-be04-f08d7c21de86/motorola_surfboard_sbg901_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d09c445-d69e-404e-be73-3f22b781841e/63904883559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5faf19-c120-4e59-850a-cfe111b8c159/ordinal_data_psychology_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201bad22-f1d2-4876-83e5-c0772ebb52ec/is_vegetable_oil_ionic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55053c1-ff13-44cd-a91e-ac9ce895c647/realtek_hd_audio_manager_windows_10_headphones_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3f6f7f-1c7d-4b84-bfd1-2f833b4d7390/84649191379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115f9113-f81f-4e35-a488-f7adf291d990/safafo.pdfIn 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_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 5388 bytes
SHA-256: c4c99be64f622cea233b8876dd47ae8ddf8212e7abdbfbf01636754e4f657e54
font_01_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 12328 bytes
SHA-256: 1cf0df41f76f36b42acdb918879fef734a566f67b36030dd922f0019deefed0e