Malicious PDF — malware analysis report

Static analysis result for SHA-256 57baca35298baf38…

MALICIOUS

PDF

81.4 KB Created: 2021-06-01 05:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 230f0a73b89f4d9190e9dce8b5f666cf SHA-1: 915d70f8b9c2159344c8abfea56bd45fe9babe99 SHA-256: 57baca35298baf3815d977b7db22879bdcdcbf6bd083d01283d6d0c4589b0a10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=vis+a+vis+zulema+frases PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff0281a52b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6048189740e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_60450c9ddc034.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/9407137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6035f1eca6b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_603fea797ee23.pdfIn PDF document text
    • https://vatelepetelijul.weebly.com/uploads/1/3/4/7/134765631/jexoxu-zosoxof-jumemefita-bidatigafi.pdfIn PDF document text
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/a982bf348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5ffcd6c85d464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fdeeacc42cd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fe15cbc78343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_6046feca7cc4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_60443d5b9956a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_600ecfc28d823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_604e052717b37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorunezagu.pbworks.com/f/tuwixu.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144432978/93435843297.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/pattern_worksheet_6th_grade.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144414648/biruponozemagikoz.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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 4988 bytes
SHA-256: f377d9076399549df049b57ad4060a019e3b6c36d2a766fc8af929d83d3228c6
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 11984 bytes
SHA-256: 026f65eeeebd5eb0f7d160b6736036e18f8ce247e773818dc0a6a87e2c629f56

Open this report in the interactive analyzer, or submit your own file for analysis.