Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27bd639bb14c7c9…

MALICIOUS

PDF

84.1 KB Created: 2021-01-16 04:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 83195ba5ee33265eacb24e0e13721d20 SHA-1: 8322e0023d684a1bb693ee9347a0ef309f76c4a9 SHA-256: c27bd639bb14c7c9081129ff1c20bc096864c81773113e63d225a909ab16feb2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=brake+caliper+guide+pins+different PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ff4e30088f10.pdfIn PDF document text
    • https://sibufelaviwum.weebly.com/uploads/1/3/1/4/131438604/6713702.pdfIn PDF document text
    • https://kibutudevitage.weebly.com/uploads/1/3/4/4/134499349/6682457.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/1857833.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/lagezuletibiju.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/miriguzige_sabakipusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5fe4337159ab7.pdfIn PDF document text
    • https://mavobomuwatu.weebly.com/uploads/1/3/4/5/134592479/xukalugajivobasuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5f94db945ce45.pdfIn PDF document text
    • https://fuvimufuba.weebly.com/uploads/1/3/4/8/134870364/lejeta.pdfIn PDF document text
    • https://pivakezajategag.weebly.com/uploads/1/3/4/6/134605748/rifelugiba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fazujo/lexus_halftime_report_hosts.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/accupyc_1330_pycnometer_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 5208 bytes
SHA-256: 4442143e22a8ea45823e8da0014fdb4af81c1ac4294ec3cf7c201c6f29ac121b
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10588 bytes
SHA-256: 859d73302d2888817d4870431f4e83590c1fc1b6d9945f8ea8478235780139bc
font_02_sfnt_off0001359f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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