Malicious PDF — malware analysis report

Static analysis result for SHA-256 b864e5a45f8952c9…

MALICIOUS

PDF

76.8 KB Created: 2021-06-06 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 595bd83f92f88e70369614fb1477eac8 SHA-1: dc9c8fcf01684481f76adee6af817bdbe3137551 SHA-256: b864e5a45f8952c91ce195b4a7c2b261d34a29b98fd506bc068631fca6f84e3c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The embedded URLs, such as 'https://queure.ru/pbw?utm_term=assassin%2527s+creed+revelations+t%25C3%25BCrk%25C3%25A7e+yama+1.03+indir', are likely part of this redirection scheme, aiming to trick users into downloading or accessing harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/pbw?utm_term=assassin%2527s+creed+revelations+t%25C3%25BCrk%25C3%25A7e+yama+1.03+indir PDF link annotation
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/d636c85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454168/normal_5febed7b69822.pdfIn PDF document text
    • https://jejojoroliwe.weebly.com/uploads/1/3/4/3/134310913/5246810.pdfIn PDF document text
    • https://serinuvof.weebly.com/uploads/1/3/3/9/133997237/a12a800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_604332fc03bae.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/zovagakotuwu_wezarexumuri_wokabavisef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_6039980c8297e.pdfIn PDF document text
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/foduxufalupa.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/zuzosuwajijabuxu.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/6763633.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/1312426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6b583c30bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600ffddda8766.pdfIn PDF document text
    • https://bivibubumi.weebly.com/uploads/1/3/1/6/131637176/0394f.pdfIn PDF document text
    • https://xidatajabo.weebly.com/uploads/1/3/4/3/134375349/foramezobi.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/6257924.pdfIn PDF document text
    • https://ziwobusomuka.weebly.com/uploads/1/3/1/6/131607005/9130080.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/fc81d1ce-5f5f-4f01-970b-21b3021f0020/city_of_glass_paul_auster_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a11b43-3ea4-4c94-ab58-a6a114b6dd08/delonghi_magnifica_s_plus_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7624d48b-4fe1-42bb-bb7d-6555f88f2a12/what_is_class_a_b_c_or_g_airspace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a21b5d4-06d1-4b3a-8741-10244bd83ba9/14726857142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81d87ad-19e9-43df-8f81-ac849a7682d4/graco_solano_crib_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed36b222-82bb-4fe5-96eb-4aa58e35b56e/minecraft_pocket_edition_beta_tester.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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 6024 bytes
SHA-256: 963f6d8d77dcebbf8558e3176ac16f4bb24037707bead4f995a5ee8d73c840ab
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 13560 bytes
SHA-256: 19897c287221897614220cc8b8befe9129ee0ce3794ef408cf1256b52b8cad83

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