Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2787513150ebdd2…

MALICIOUS

PDF

83.9 KB Created: 2021-02-13 22:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 82f409c67c18ee989fd2801b042fb174 SHA-1: 4cdce2db5cdf34b054f05c39bcfcd1368f202a0b SHA-256: f2787513150ebdd2b34064db01fa1bb88f9b5d6e1c1ac5cb4e4b7ee9cdade016
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of external URI links and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

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/wix?keyword=crash+fever+apk+jp PDF link annotation
    • https://cdn.sqhk.co/mogowepuw/Shagpgd/playerunknown_s_battlegrounds_pixel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_6018b727277f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifixebug/c3jdhf8/family_feud_meaning_in_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_600e738150484.pdfIn PDF document text
    • http://dress-russia.ru/serenabosumanitotobeboratlzgj.pdfIn PDF document text
    • http://evilcheats.fun/267945729643ieel.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/Adjcjbc/49383696079.pdfIn PDF document text
    • https://cdn.sqhk.co/vazodowadu/YeZ0gY9/relitako.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/bghRZWM/zombie_haters_best_character.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/WicZVii/wings_etc_minooka_illinois.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/jd7ibgd/cdc_guidelines_for_covid_exposure_at_school.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/Tdijjg0/messy_monkey_banana_bread_bars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_600e8a875252f.pdfIn PDF document text
    • http://letnesil.xyz/defender_bug_zapperunseg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/4129016510.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/559873323.pdfIn PDF document text
    • http://govatojajij.epizy.com/puxitovofijurojiwipel.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/ap_chemistry_calorimetry_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/43966679604.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/michael_jackson_al_capone_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 8348 bytes
SHA-256: 26db897a8a80a1e9c22286ffb9ff6d21ae20dd8e31f84512471a29ae705fdb64
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 5064 bytes
SHA-256: 1f3755fb5e6ede14d52266444d92ae2672d947e26ef514f44c670b510ab36c36
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 12632 bytes
SHA-256: 48781ea892613da037e4032089bc9a56e975f54cf88190962d3d623c971e599f
font_03_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 16376 bytes
SHA-256: a678fa6e7ea564dcb400abd7962a5fd366c9dedc3e1b55bcd9f929aef3e15083

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