Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73eb84beacff9b7…

MALICIOUS

PDF

82.9 KB Created: 2021-02-21 11:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bf3d257b067fa71431dffe3388481159 SHA-1: d4dbf26fa7a023ab877a9e4858f901c3dd5f4ce8 SHA-256: e73eb84beacff9b718b8b1b79b7ca62717e06aac5bcc4af703b404758e1af5b4
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a lure. The PDF's structure and the presence of multiple links indicate it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=best+m65+field+jacket+with+liner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5fdb8a86b5f66.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/P4geUdK/forward_selection_linear_regression.pdfIn PDF document text
    • http://zumarez.22web.org/pathophysiology_harsh_mohan.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/51ae94c023cd55.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/d04fb4b3a1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_602d8d251f4f2.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/tuwutoxivevag-pekutikir-wezugotuwajed-kowebilep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_6018b604dcf59.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/jidijhf/fudaxelasajuwenodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_601b44234b043.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/gjhjeia/16358139798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fedce9ce7bf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fdeeca5f2aaa.pdfIn PDF document text
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/wetevepezigex_xusekogidiseto_zanaxobunufukus.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/igghjfL/laughing_emoji_meme_copy_and_paste.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofuxolisemaxim.epizy.com/87011875143.pdfIn PDF document text
    • http://gawevoniko.rf.gd/alinco_dj-500t_mods.pdfIn PDF document text
    • http://gosigugul.epizy.com/sekigipusefi.pdfIn PDF document text
    • http://wogafut.rf.gd/loluzoradixobepudusul.pdfIn PDF document text
    • http://xodojes.epizy.com/watilaxaruzanov.pdfIn PDF document text
    • http://finedati.epizy.com/possessive_pronouns_exercises_3rd_grade.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_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 5820 bytes
SHA-256: 0f0ef956985ada8ba3528e022636abe17dca8c1b960eaec8f0db9bfbefd27554
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 11008 bytes
SHA-256: ff0bd3a8e9f3833c07c578b09d03bb72c5ca1f70439f3203d3e014f7efc79529

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