Malicious PDF — malware analysis report

Static analysis result for SHA-256 804a5feb3575bd6d…

MALICIOUS

PDF

74.8 KB Created: 2021-04-08 01:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83632f2914051d98373d891549d2bd26 SHA-1: e59fa09eb588b0621e9b1f9d2b9eaef10a4b60f1 SHA-256: 804a5feb3575bd6d48d41eaeef1461e09bbc4d1a30598d61969e7aed06a5e5fd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'molarity problems worksheet answer key'.

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://jacksth.ru/wix?keyword=molarity+problems+worksheet+answer+key+chemfiesta
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5ffdf4ea0859d.pdf
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fec1f9b368d7.pdf
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fd2f89e41547.pdf
    • https://cdn.sqhk.co/tiwumixe/1Vr4jgU/tuvunine.pdf
    • https://cdn.sqhk.co/kidurukazag/gf2ocgc/xukafopomotegorezuzokigid.pdf
    • http://specialsale.info/fotazakadevewofe55yvx.pdf
    • https://cdn.sqhk.co/nuduniguwufo/txghdwd/pocket_rocket_slingshot.pdf
    • http://tewepeserero.22web.org/6489543581.pdf
    • https://cdn.sqhk.co/fuxiwimemo/Njhc3hc/hair_salons_open_in_pittsburgh.pdf
    • https://cdn.sqhk.co/nenakowi/jdHjajb/kakooma_addition_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4426816/normal_604de8e534f03.pdf
    • http://erogancolumbia.site/viligasidulafumfeqj2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fejaxiwezi.epizy.com/36092766289.pdf
    • https://uploads.strikinglycdn.com/files/68c9bcf3-caa0-4be2-94a8-9a7919baeb99/52686669609.pdf
    • https://uploads.strikinglycdn.com/files/e756e0eb-7919-41e8-a4ae-e4668603bbca/how_to_use_zoom_h4n_pro.pdf
    • https://uploads.strikinglycdn.com/files/093d07a2-121d-4de3-86a4-74ec693950dc/how_to_invest_money_in_indian_share_market.pdf
    • http://rukawinasi.rf.gd/8991206506.pdf
    • http://rixogapokat.epizy.com/gusuworuden.pdf
    • http://rexuxos.rf.gd/2815774215.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_off0000e6ea.bin
0b78793246da67ed255e2b3c0a9c6f858f19eee549a99e2e6e2a7bb117ea20fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5656 bytes
font_01_sfnt_off0000fa20.bin
4003c5ca31d84c20b5dccd3b4739d56d2251c4475fc107e8a487f7ffb309373c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10464 bytes

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