Malicious PDF — malware analysis report

Static analysis result for SHA-256 7756da7bff71eb3b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 11:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ef3c7ffe4cb29ee81fc2f85edf1bc09 SHA-1: a41eea53924c3d04bda0c0638c420ddad311ee12 SHA-256: 7756da7bff71eb3b98f58cfcfea25f1d801d576909d10536c8c15c80aae3203d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'midufefew.ru', suggests the document is designed to redirect users to potentially harmful websites. The document body, though partially corrupted, contains text related to a printer issue, likely serving as a lure to encourage users to click the embedded malicious link.

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://midufefew.ru/strik?utm_term=officejet+4630+will+not+power+on PDF link annotation
    • https://cdn.sqhk.co/xeduwukaxusa/ddnja0q/zovobexox.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/ijZXkpl/fox_racing_moto_gear.pdfIn PDF document text
    • http://1xbets-regs.site/pavewobenigisimijabpp82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6011fba32734d.pdfIn PDF document text
    • http://ooovseanalizi.ru/how_to_retake_istqb_foundation_level_examvig1h.pdfIn PDF document text
    • http://blekrossi.ru/what_does_it_mean_when_a_person_has_no_conscience9gp6r.pdfIn PDF document text
    • http://reduslim-siteofficial.site/album_songs_status_tamil_mp4kddfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_602dae31ad735.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/Bhdgiij/41479952237.pdfIn PDF document text
    • http://natural-shop.info/fogefudovznr9k.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/hh3w0VB/91974487141.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/xafugeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://senoburem.epizy.com/rotenobiwufipe.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/vojuv.pdfIn PDF document text
    • http://vexekuvo.rf.gd/how_much_do_military_dog_tags_cost.pdfIn PDF document text
    • http://sepuxukejobome.epizy.com/1st_arabesque_debussy_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a59d72-4156-4c5a-ba27-020fb54ade50/sufeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3e6d93-4343-424e-931e-862bdba42270/tolafonitiloloj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5152 bytes
SHA-256: ba9b9909e923c8d391fc7707825abc1e7847cad80c545aba717aabf99dfb65a7
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 11104 bytes
SHA-256: dad15c7f47d29acbbcc5d938fdc5788d0ea24f4d418cec5f8e6210bcbb0dfefc
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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