Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f91a95d1276eb45…

MALICIOUS

PDF

79.8 KB Created: 2021-05-17 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 20c5c5e31e74ad060cd2ba5f0a17475c SHA-1: 412eba17d84413acd93c11ede89058626fb55638 SHA-256: 3f91a95d1276eb45ee6a654d58cdac779a0041540e5d0201051ed264aa128cef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The primary URL identified, 'https://lozipotod.ru/strik?utm_term=...', is associated with this malicious activity. The ClamAV detection and ML classifier strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=why+is+my+hoover+washing+machine+making+loud+noise+when+spinning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489414/normal_603c725a23ff2.pdfIn PDF document text
    • https://zafojulokigod.weebly.com/uploads/1/3/4/7/134741370/799396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_600794cd09a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_60495b6c1d4fe.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/a00d1.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/c3f0e92604505a.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/xufobejuziv_zofefaxat.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/998597ed12aebc3.pdfIn PDF document text
    • https://mubikobilowopo.weebly.com/uploads/1/3/0/9/130969089/wevimixika.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/fafuvinadin.pdfIn PDF document text
    • https://xesolisozewil.weebly.com/uploads/1/3/1/3/131379689/fewuw-fivujevotoj-bifekeveluwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5ffbf5ce32de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_60469710e475e.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/3771b30.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/f6ff0022-bd0a-47ce-9a41-f22b860b10ed/how_to_pair_blueant_st3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f0b81f-2a97-42cb-8103-7f50ebb7f64c/nas_d-link_dns-320_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ba312-70a1-4e72-85c6-4ebfe5c7d606/17_indisputable_laws_of_teamwork_workbook.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3898a0117750489f97b97d21a69df72a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0319a3b-de4c-4d0a-b2a3-dfe8488ba9b0/throne_of_glass_series_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/oster_turbo_a5_2_speed_clipper_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/absage_bewerber_formulieren.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/karuppusamy_kuthagaitharar_tamil_movie_hd.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_b331214f037740b6afc5be4c697c6db7.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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 5820 bytes
SHA-256: 453eebcda9c824f8e03b5171b915ec88a3ff4dbd2531f02894b6ff5229ffee79
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 10988 bytes
SHA-256: fe13a20ab6645edfa7aa0c9a58ddbd0096174fff524003e8935af763dd4a67af