Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49d29b936eaeb0f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-13 18:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b12eecaf5e54e24054c9e0f16df0539 SHA-1: aa170a0b43b2d4f6127b05bdb3ca1985c0e40c26 SHA-256: a49d29b936eaeb0f0a5b0408a9cae172e9a3025a07bf235c9c33bff74f8b76a3
126 Risk Score

Malware Insights

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

The PDF document is detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', which is a common tactic for phishing or malware distribution. The presence of multiple disposable hosting links further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jacksth.ru/wb?keyword=guided%20reading%20activity%206-%201%20answer%20key PDF link annotation
    • http://smartbright.club/marty_robbins_big_irong0fpu.pdfIn PDF document text
    • http://reactivascotia2020.com/new_fruit_pop_bubble_shooter_mod_apkgdnn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_6027a301c8b99.pdfIn PDF document text
    • http://wekeb.space/imca_diving_guidelineso9k19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501989/normal_5fe0b565b2e4b.pdfIn PDF document text
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/c0d3c8.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/neniwuwikefizom-belujopo-voxaf.pdfIn PDF document text
    • http://cosmeteca.com/peggle_blast_how_to_get_long_shotsyyrdh.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/3411991.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/5059043.pdfIn PDF document text
    • http://clientesdkb.com/95397646180a7ohy.pdfIn PDF document text
    • http://maturibcgj.space/hamburger_paragraph_writing_worksheetfk4ak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5ffc2df34e93d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sexikiti.epizy.com/xajetijukoriruwege.pdfIn PDF document text
    • http://pasivete.epizy.com/carrom_disc_pool_mod_apk_unlimited_diamond.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5660 bytes
SHA-256: abed7eaafee56a711a82b7f3cf8a73f70bf081a41cc092d5010c5819608010a4
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10056 bytes
SHA-256: 6248eeadce37cab4e47059386927217ad8c75a60cbc81bb49e67745f527b6d0f

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