Malicious PDF — malware analysis report

Static analysis result for SHA-256 027db57dcf7f26a7…

MALICIOUS

PDF

74.1 KB Created: 2021-01-12 11:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8be2a5065179d4e5f0542f12dbf9f9f3 SHA-1: d1e3f62415f3c17c32d14be25f0589c6967234ad SHA-256: 027db57dcf7f26a7f4e650a0709f6c7d57ebf1f562acd957bfd8bbde37323dcf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as part of a phishing or malware distribution scheme. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content as legitimate resources.

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://trafffe.ru/aws?utm_term=block+sites+app+for+android+phone PDF link annotation
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/4254472.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/9c5353a4bc.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/caregivers_wanted_near_me.pdfIn PDF document text
    • https://site-1178842.mozfiles.com/files/1178842/bayad_center_form_for_sss.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/tixaxanojoneva.pdfIn PDF document text
    • https://lolozodosut.weebly.com/uploads/1/3/1/6/131606575/3785716.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/sutipazesisu.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/26ac381b921e5.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/gadegedikojol.pdfIn PDF document text
    • https://site-1192273.mozfiles.com/files/1192273/addison_rae_dance_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fe940189eb95.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/pavedelivapo.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/7149808.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 5144 bytes
SHA-256: 500fcf025719843c622e1f2e62241f21fedfd3d3887ea7ec3b2aef67bf9c375d
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10428 bytes
SHA-256: bf57b26b2773bbd6cab3462272ce34c351bd8e2658c52eb3a0daf42db3484edf
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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