Malicious PDF — malware analysis report

Static analysis result for SHA-256 8607bf725862bb12…

MALICIOUS

PDF

108.8 KB Created: 2021-04-15 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ceb66e392c2156904cc6500a2aa073c SHA-1: 7b1c70dbe564917b66c1a6262a51795ddaf0c238 SHA-256: 8607bf725862bb12d00504cf520a7b9d479484fe1618f67389dd7f60d4a2761d
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 sites. The document body, though heavily obfuscated, appears to be a lure related to the death penalty debate, likely intended to mask the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=should+the+federal+government+abolish+the+death+penalty+pros+and+cons
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/mosetilimamajo.pdf
    • http://nobukuxokosiga.mypressonline.com/14172175175.pdf
    • http://lipatajewaxo.22web.org/behavioral_biases_in_investment_decision_making.pdf
    • https://cdn-cms.f-static.net/uploads/4377924/normal_602a9e5755081.pdf
    • https://static.s123-cdn-static.com/uploads/4414357/normal_6004f1edce2b1.pdf
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fe070cd41953.pdf
    • https://zafapajesat.weebly.com/uploads/1/3/0/7/130740498/nitipabikageniwataz.pdf
    • https://xesawamerubipox.weebly.com/uploads/1/3/4/6/134629950/5df7b45.pdf
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5fdf79982b5c5.pdf
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/kolibitesidabagolo.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://rodisawikikofu.medianewsonline.com/gazoxolilusulagufipatojen.pdf
    • http://taptopbot.com/gbc._emu_apk_1._5._37_downloadjv7zi.pdf
    • https://cdn-cms.f-static.net/uploads/4444864/normal_60541216c5a7c.pdf
    • http://lefegowoxivi.iblogger.org/cv_raman_university_courses_list.pdf
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/309440.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safedoguno.onlinewebshop.net/zijam.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_93eb89db60d542dfbee145eac1045da7.pdf?index=true
    • http://nubibubimalepik.atwebpages.com/62012543424.pdf
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_8866514cc5ca49e7ba85bf66b894558c.pdf?index=true
    • http://tefozofikiduja.epizy.com/autobots_names_in_transformers.pdf
    • http://ripofosefalub.rf.gd/kitchenaid_burr_coffee_grinder_manual.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_off00016915.bin
d53253d275767033ee1bfee366962d677ba1a9117c63a8a88d82aa4374a1f806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16915 5976 bytes
font_01_sfnt_off00017d4b.bin
89221aa78d5f49f269db44280c80279ed55e565bd5894fb4c55048c5c1c6c327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4B 11612 bytes

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