Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2546c817da327e…

MALICIOUS

PDF

74.5 KB Created: 2021-02-05 12:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6152d6202180a4156db4a74cfcce3697 SHA-1: e24c76f8a2abccb48848129b999821b22206d456 SHA-256: df2546c817da327ea3a03197c3a8734dc79191eebc5b2c7760a62b176561e104
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spamming operation. The document's content, though heavily obfuscated, includes a reference to 'Orland high school parent portal', suggesting a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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://leonvi.ru/123?utm_term=orland+high+school+parent+portal PDF link annotation
    • http://nedosako.iblogger.org/anno_1404_beginners_guide_walkthrough.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/18671199637.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/Upiajdq/30524951953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fd6e4478196d.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/0HjdJDS/my_talking_pet_pro_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477620/normal_6003fca10e84d.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/1816398.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/lomalipod.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/kufivize.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/bejalijejuxeru-viwojotal.pdfIn PDF document text
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/poxafij_munutusod_mejese_vavemule.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ghmhcij/lomufuweke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5ffb50fd3d93d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/flight_simulator_for_phone_free.pdfIn PDF document text
    • http://vezigaje.epizy.com/51558489524.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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 5360 bytes
SHA-256: 38e487ec6059f24176b8cd96a099994d4d9d8368b85b7c4c972266417f468bbd
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10268 bytes
SHA-256: 5afcf1fe900975b5b53dfcb4afc3439679a5e58b4d1c1fbcaf5ac4e11735494a

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