Malicious PDF — malware analysis report

Static analysis result for SHA-256 9797dfa46df4d0b9…

MALICIOUS

PDF

78.3 KB Created: 2021-02-26 00:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80bfb4e9435b0996771637092aad4040 SHA-1: 1816d1fc8936036f6213e74bfd1b0e2368407069 SHA-256: 9797dfa46df4d0b915f34ae237acb19a1a48998dc8dae92657a25878d63441c6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://yafferge.ru/wix?keyword=frc+stronghold+manual In PDF document text
    • http://gufutaca6.xyz/what_is_organisational_behaviour_in_managementquaae.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/how_to_use_logitech_k520_keyboard.pdfIn PDF document text
    • http://ionatr.fun/fukudamifetar60j0.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/ggGggRu/43219918270.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/moen_sink_faucet_parts_diagram.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/honda_rancher_350_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/a18jjJg/sezogiwaxoralosibofuxer.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/JgggPig/guess_the_celebrity_roblox_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fnlLkA1/32942540474.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/bifalefugaxax1gvs.pdfIn PDF document text
    • http://service-hire.com/futobqwsmr.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/aidUX2c/35750918760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/zozelawogu.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/husqvarna_460_rancher_carburetor.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_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 5308 bytes
SHA-256: b241fea24d8e51dc00dde2b5d08084e2f601f143f206000bfd7a1fbd47ca7a37
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 11044 bytes
SHA-256: a24401b61924c6782d4d73d6085b7ee4ca9b4cf35a6884517805ff2facb8c78e

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