Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f6a6872eb315ab…

MALICIOUS

PDF

77.6 KB Created: 2021-05-20 17:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 29d125336eb16d727446f9a6125d2bb2 SHA-1: 7867e4a5d18c525a62ab9f6534e0dbf6bfed9e6a SHA-256: 49f6a6872eb315aba10287f30f8fb0aa048b1ea4019855cc89445e44e530ff67
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, appears to be related to search terms, further supporting a lure-based attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://gimoguvi.ru/strik?utm_term=troy+bilt+horse+serial+number+lookup PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fe4880bbfabc.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/6563251.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/4456330e40e.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/665006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415081/normal_60047153bf288.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/a17c9bb46c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_602fec0858c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_604f759e22342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_600fa041b1f0c.pdfIn PDF document text
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/1319dafb7182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5fec68ac84157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60141c0cd8b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe6eee00b47d.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/wiwuxoserijibepixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_5fd9e88e6de1e.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/ca1f4113-4a4d-459e-a3c8-394ed1523bd4/fiveriwita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60025f5-a5f1-4274-897b-bbfff83e65ae/39127545458.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/spider_solitaire_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/why_is_diversity_important_in_the_legal_profession.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/firusivokome.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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 5316 bytes
SHA-256: 70cae758a56685145a0c439c81382d785f21be666134a05e6655e1b923619696
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 11316 bytes
SHA-256: fcfd66c1873240a65045efa528d685a8d69d8ee1e546cbe291a73291625ac17c