Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88360577b191a56…

MALICIOUS

PDF

75.2 KB Created: 2021-05-25 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa2f9119bfb25567d497672702cc7e18 SHA-1: d7ca8ce84367a1e5bea7c71d3468b6d980b863a1 SHA-256: f88360577b191a56fef5fd60769608887f0ce8295ccd66e7e15ff9a64518afb6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=download+lagu+sonia+mp3+full+album PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413980/normal_6041937d2e828.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/9388158.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/8390190.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/xenowitub_pufidowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60219d3c82780.pdfIn PDF document text
    • https://xudiruxi.weebly.com/uploads/1/3/4/6/134630049/cc99c4c4e9647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_6007c7731ae59.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/6eb7f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davubewu/90886728609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6785cd3f-416c-4278-8a1a-4c1481db78e6/49724822060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ce4c47-c138-47f0-bd56-cfbf7bfbb8b8/59828926304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1258156-7313-4620-a40e-12c19891a135/nibokitoxiluzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997cb2b6-5a44-4c50-bb94-17d536fb9973/62398372303.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/how_to_apply_vinyl_decals_without_bubbles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d185bb84-a888-4871-90a0-4e91018fe89b/when_will_a_nashville_christmas_carol_be_on_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/autocad_3d_blocks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/54813446875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1486554f-e25d-4c7e-91c3-bebdd65d424a/28109727716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d76cfce-cdfa-4680-b94c-a42ebd5e22a1/zuvujetinawimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04e3f9e-cd11-47ef-a4b1-88c039a550bb/how_to_watch_discovery_of_witches_season_2_all_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013556ae-158b-40a5-9789-b016a1f5f79b/jailbreak_iphone_xs_max_cydia.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5660 bytes
SHA-256: 5e8ff96634dce1cb7a87697614f7906371444e0682d08dabbd73f78626bdb071
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10608 bytes
SHA-256: 6b081da3e5613cece241c30cda8bb3ebcad5b1a3481887013c69892ad7d63422