Malicious PDF — malware analysis report

Static analysis result for SHA-256 431c2e3096e06078…

MALICIOUS

PDF

68.0 KB Created: 2021-04-02 00:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c88a5f3ca40c754051fc4ce248ab4c07 SHA-1: 420ec3d06287d6e44b9f432fa4a08b629a04b7ea SHA-256: 431c2e3096e06078ca121b147338b122e8e79eae799abb6009e43d2f723bb183
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'calculus problems solutions and tips pdf'. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=understanding+calculus+problems+solutions+and+tips+pdf PDF link annotation
    • http://kidupat.getenjoyment.net/briquetting_technology.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/71861971583.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/65463960322.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/gijd9md/53764623418.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/sally_s_phone_oxford_bookworms_starter.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/5ejgjcj/gubijifoxewitefigagavabo.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/hgfLRic/25052290201.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/biology_class_11_chapter_2_ncert_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/kudewigi/YGghUgd/bordereau_d_envoi_western_union.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/hjsGgim/day_r_premium_mod_free_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/GXTBVji/ice_cream_running_dog_pillow.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/rovuweraja/dazurumatagizasakimurigef.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/cengage_mathematics_calculus_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/regoberibigawitikan.pdfIn PDF document text
    • http://kageditivumimor.onlinewebshop.net/81223030901.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/biwoxebuxizoju.pdfIn PDF document text
    • http://joxaralabodegad.rf.gd/android_studio_version_control_tab_not_showing.pdfIn PDF document text
    • http://xulojasadiv.epizy.com/gyromancer_xbox_achievement_guide.pdfIn PDF document text
    • http://mozifawa.rf.gd/99521517465.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 5604 bytes
SHA-256: 09a9e168fa5f4f0bd6671b7052733ec61c999361e5b8db16a4ccdb34858adfe1
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10368 bytes
SHA-256: 29b5411fb9b7f99c2d8622cc581d49d25761a56a25c357c3ff3a460f35e7c2a0

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