Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ec01d9f153aedb…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 02:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23d376c99be6d98f07cc0362ea0156e4 SHA-1: 81ffc2f907c8d093350e48032f438bdc6e237a28 SHA-256: 37ec01d9f153aedb4d3628474ec3724cb0d47cf0bbcc1ae7fdc35bf5f9ddb48f
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous external PDF files, likely intended to redirect users to malicious content or downloads. The primary URL, 'https://garglob.ru/pbw?utm_term=download+game+clumsy+ninja+mod+apk', suggests a lure for game downloads, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/pbw?utm_term=download+game+clumsy+ninja+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372721/normal_60c106d791868.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/lazosozub.pdfIn PDF document text
    • https://wotufoxak.weebly.com/uploads/1/3/4/3/134308946/951788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_6028a67c42aae.pdfIn PDF document text
    • https://bolomomotune.weebly.com/uploads/1/3/4/7/134762543/d429016203cf09d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_604bacee22bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367299/normal_6005380a8feaf.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/lodarifoxodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_601d5f0e930b8.pdfIn PDF document text
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/4683954.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/vekedutewibo.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/zukej-pumakalugaf.pdfIn PDF document text
    • https://zidereromozuj.weebly.com/uploads/1/3/4/6/134602294/6773304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_60b8732e05fdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5fc80f24e4efe.pdfIn PDF document text
    • https://desemezek.weebly.com/uploads/1/3/4/4/134458593/5a9d15e8780bd5.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/muruxewiziridelovoja.pdfIn PDF document text
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/2804228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600e46cda84f1.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/4d477435-392a-40e1-ae5e-f6182ad8bab3/93096275216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4f550a-8df9-4eac-ac03-a6e1710627f8/68600449431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e468902-de77-4cf4-98ca-d0616cf3aeb7/defensa_siciliana_variante_najdorf_pedro_cherta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080e7180-cbf6-49c1-92bb-5831cac8950f/resident_evil_6_official_strategy_guide_download.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5632 bytes
SHA-256: f3cb8e0b8bbb101ccfe12fe04d6215e0c0dfcfd8b43498db6eb97cd135b775ea
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 13096 bytes
SHA-256: a9c91ba4058f860f8666652175b2c410f48740eca3eccd289a0062826aacab3f