Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcc07995d3f81f4…

MALICIOUS

PDF

83.3 KB Created: 2021-05-11 04:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7e0199d37ab58e971abbb8bd4d96def SHA-1: 33de7e87642bf956153722244989ef9665d5ad26 SHA-256: 8dcc07995d3f81f4384faac8adfbb2a0f627a9a52c75afd4f5a418af6c8002e1
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=honeywell+surround+heater+keeps+shutting+off`. The document body, though heavily obfuscated, appears to contain text related to search queries, suggesting a phishing or scam lure. The presence of multiple disposable domains and Weebly subdomains hosting PDF files further supports a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=honeywell+surround+heater+keeps+shutting+off In PDF document text
    • http://rigoditibalun.mywebcommunity.org/79106469210.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/ecb37f3.pdfIn PDF document text
    • http://vvinorama.website/gravity_falls_book_1fjscu.pdfIn PDF document text
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/88c897af430d.pdfIn PDF document text
    • http://fenellalucynelle.info/north_star_imaging_flower_moundpn6sp.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/bebelugavekufa.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/bijomegumelim.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/what_is_the_best_qcy_earbuds.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/pidixekero.pdfIn PDF document text
    • https://zovuzutozureje.weebly.com/uploads/1/3/0/7/130739602/154e49a3655c7.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/donarepemi/53404092444.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/20809769106.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/brain_on_fire_susannah_cahalan.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/ics_after_action_review_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/ferazokojelu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/wujagugunikitagat.pdfIn PDF document text
    • http://sogaviwezed.rf.gd/split_by_page_number_online.pdfIn PDF document text
    • http://vibulowivez.epizy.com/63376013642.pdfIn PDF document text
    • http://juripijesem.rf.gd/95034624278.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_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 5524 bytes
SHA-256: ba738b5b48f1baa57342fb49ff7d80bce70e28efb08a44ed85199e5a88fcdda2
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 12412 bytes
SHA-256: 9ecbecb5f441c74e38be576eece2a06a2ad799b1159380c79c0cbca3686a24c0

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