Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b25cf13c71842c…

MALICIOUS

PDF

111.2 KB Created: 2021-05-25 08:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c3909c6bae280efc66e23a7a9a22389a SHA-1: e8d817d979e855b606d34040dbb0381c2ca4e8b9 SHA-256: f0b25cf13c71842c754a84c02af3611f0a0c0178f5e7c1e7a6fd29ea6804522f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or SEO-based malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=kingmaker+region+upgrades PDF link annotation
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/puwegugesomejurupo.pdfIn PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/1716095.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/5e6254c.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/raritifepaves-ligagiragude.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/3546623.pdfIn PDF document text
    • https://vasiwamalag.weebly.com/uploads/1/3/4/0/134012587/8012351.pdfIn PDF document text
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/pitofegaxixuno_pilugo.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/72686eaa.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/nerugiraxura/93994382938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93402dbb-d6d4-42ef-9881-090b89e6e66d/63210273613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2ea7d4-6c26-4437-a9e7-41016b91ee0f/how_to_set_up_my_tassimo_happy_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6210842-c7ce-4631-96d7-9f37bbbf5e16/zexorivirexakegowon.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/33829426503.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/50256887465.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/gakkou_gurashi_yuki_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68a3eed-9cfc-4649-8312-b8377a044465/guxifezamarujeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd3bba2-eb74-4412-82d5-bd86be48a8e8/95289521702.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/nirakipiluxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa5bf99-bd37-48d6-a13c-141b0a45054c/34954270401.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/anselmo_ralph_o_cupido.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/zowifoba.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/13770224999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e64106-2469-469b-849e-a4e0be9b0992/zapebipuxujikajad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d322cd4e-58f8-467b-9b87-3085fcb622dd/list_of_non_flowering_plants_in_the_philippines_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/free_creative_curriculum_vitae_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2dd95e-df32-4b74-bbe6-f92dcb6b0fa8/sejofulokojonubifawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd43bed2-61b8-4901-a32a-24fcedcc5aa2/who_wrote_the_hymn_will_you_come_and_follow_me.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_off000174f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F7 5280 bytes
SHA-256: d684e138945770b5a0cf77ef8e09361eab043f4a78914e84250875baeb96b260
font_01_sfnt_off000186d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D8 11936 bytes
SHA-256: fac247557efbee4d506041d50c6ec77b6f6245f07a05534bd5ce94ce2791eccd