Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9049847b0eb913…

MALICIOUS

PDF

80.2 KB Created: 2021-03-18 18:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ff6198e76d8ca8adb53d1c0a8d564f SHA-1: d184a4f65e79a726ee99b1b09266aeaf341961b3 SHA-256: 7e9049847b0eb9131a9d006b0fe8b8e0bd09f285c18fcc58365df2f817800cbe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Fossils and relative dating worksheet answers', indicating a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=fossils+and+relative+dating+worksheet+answers
    • https://waduwira.weebly.com/uploads/1/3/0/9/130969623/povazifuzejine_xiduverideb_nujeto.pdf
    • http://tameeniraq.com/examples_of_python_programsg3bbh.pdf
    • http://jerunurijo.iblogger.org/41525950023.pdf
    • http://wopexobow.mywebcommunity.org/aqua_logic_goldline_controls_manual.pdf
    • https://jumugixaz.weebly.com/uploads/1/3/6/0/136028190/zofizagepaf-sikomarub-sinabonebedi.pdf
    • https://cdn.sqhk.co/pixorikibam/0zjj91z/61307666625.pdf
    • https://cdn.sqhk.co/juroniwubiji/Icigjcq/married_couple_images.pdf
    • http://jisotevujemi.22web.org/sebibazowovafukusazivik.pdf
    • https://zisumujabi.weebly.com/uploads/1/3/5/3/135315444/325848.pdf
    • http://wojournal.ru/what_is_geocentric_theory_used_forjqbj7.pdf
    • http://lojasamericanasbr.com/what_is_the_moral_lesson_of_cupid_and_psycheydo8k.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/rumukelifizo.pdf
    • https://cdn.sqhk.co/lamiwifa/ggdlDgg/wolufewosifegop.pdf
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/pebiv.pdf
    • http://wuwodijutorem.iblogger.org/turbochef_fire_pizza_oven_price.pdf
    • http://zagavogafewakud.iblogger.org/libesomokitepogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mowamaxemowume.epizy.com/towazawumiduregefisapo.pdf
    • http://kivarutumo.myartsonline.com/applied_linguistics_to_foreign_language_teaching_and_learning.pdf
    • http://fejonaxi.myartsonline.com/billy_joel_my_life_sheet_music.pdf
    • http://vorasatijede.rf.gd/zeparapixofunut.pdf
    • http://duliwijedij.rf.gd/771439804.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f804.bin
84d24cec88c39401afc440ca96c08a641d1b3ee96de11fa526390c94841c1315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 5260 bytes
font_01_sfnt_off000109f8.bin
c9212c0bd35db1963d4bc265c8758861a28422ad9a77f0cac747b7edf38bd44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 12688 bytes

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