Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3da97a15a4d103f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-11 19:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0a314abda44503aba4339beead185fc9 SHA-1: 97e6d417053ad5ea534f9cb293590a6f4913688d SHA-256: a3da97a15a4d103faacd7a4c2dfc83084ce6bdbacc77c0f5e8ea0fd89775ff46
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the structure suggest an attempt to lure users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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/123?utm_term=boss+baby+2+full+movie++free PDF link annotation
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/gikabu.pdfIn PDF document text
    • https://rotonozi.weebly.com/uploads/1/3/5/3/135315410/9100553.pdfIn PDF document text
    • http://aromaita.space/zugajenagigoruvirafonijws05w.pdfIn PDF document text
    • http://submonster.xyz/50_pips_a_day_forex_trading_strategyh96yv.pdfIn PDF document text
    • http://biggymstoe.com/dokdo_toner_reviewpdp0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5ffa392240549.pdfIn PDF document text
    • http://auto-fishing-rods1.club/518742141475y16q.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/sasevagojibixur_firumif.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/1029863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6046bbd222417.pdfIn PDF document text
    • http://pagebake.com/gram_negative_bacteremia_guidelines_idsacw1r2.pdfIn PDF document text
    • http://bristol-yalta.run/tea_cup_pomeranian_dogs9phu5.pdfIn PDF document text
    • http://my-favshoph.online/miwiduminuwutagiba692bm.pdfIn PDF document text
    • http://winsl.space/rininijoz1yfk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fd8b1ce8c2a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_b9d1cabad0f74bbebc80f76824dd0db7.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_8a2eaf1cec02469ea0da749af8fb24c9.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_19c8b8b9788c427099e3b7392a72f00c.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_036322b505164db48defa02fabd3f574.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_40ce6a5eb4794f809af170b1ccf307eb.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_72b19ae15dd14a15ae227211fd21e41f.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_8e066b63088b4e5c9eb869d6ccacba03.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_f20ca751d32c4de1b2b7c0439a461747.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8bfe399f756546c386dd72392aa89b2a.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_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 5396 bytes
SHA-256: 2909c2f87d6167be9a165e9ef4b5e820597fb37f2cb12f6693e121f0a37ecbef
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10196 bytes
SHA-256: b7d356e98bc83aad672f992060137201a7b4943f1e099435d813b0e1394eedc4