Malicious PDF — malware analysis report

Static analysis result for SHA-256 752e7fea09dec708…

MALICIOUS

PDF

86.1 KB Created: 2021-03-21 09:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca429c52a99793c6d1c79e3357c9319 SHA-1: 100b2acbcad283030f987100c5b6c2988b6eead0 SHA-256: 752e7fea09dec70844a001012d447416032f227b2cc39e3ae5fa929b80023d54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jottigo.ru') that is flagged as an external URI and part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=tcs+aptitude+test+questions+and+answers+pdf+2020
    • http://mowuvivof.22web.org/big_fish_casino_mod_apk_android_1.pdf
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fe8328393e11.pdf
    • https://cdn.sqhk.co/miraroki/jvjgiiG/magic_tiles_piano_despacito.pdf
    • https://cdn-cms.f-static.net/uploads/4501660/normal_603cc471efb57.pdf
    • https://cdn.sqhk.co/goxobuve/g9Dz12H/70328598716.pdf
    • http://xukigebek.iblogger.org/lezidanevizagizuforobajup.pdf
    • https://cdn.sqhk.co/wibetaxor/pkIhahf/51160931103.pdf
    • https://cdn-cms.f-static.net/uploads/4408991/normal_6047a37365a98.pdf
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60198751bad58.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xirixepo/34188390565.pdf
    • https://uploads.strikinglycdn.com/files/0b265972-440b-4c24-9cea-78c05ca57f9a/the_power_book_plot.pdf
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_17a01ae645f64841adfb2415780dfb6a.pdf?index=true
    • https://s3.amazonaws.com/sojaxub/2016_chevy_trax_lt_manual.pdf
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_38bb5d30b7fc41af884cc2e4db4de603.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_11063fce899e4f91a1fc63337cf1e6d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f8bd60f-912b-4024-9508-872fc2a696b8/nadakuwatakukikaxolodo.pdf
    • https://uploads.strikinglycdn.com/files/71d09a72-597c-416e-b81e-fc275e582e42/sunbeam_electric_blanket_controller_nz.pdf
    • http://pajoxewujovero.rf.gd/already_yet_still_worksheet.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_bd20c34f285d4979908e788b9ccb84f9.pdf?index=true
    • https://s3.amazonaws.com/xulikamul/vuwut.pdf
    • http://badiwiv.epizy.com/natiwigigesakusinogase.pdf
    • https://uploads.strikinglycdn.com/files/733b99b3-eb8c-4b73-a269-79f85e3fbbdf/how_to_change_baby_g_watch_battery.pdf
    • https://uploads.strikinglycdn.com/files/1139703f-c497-4218-9790-3e769235e4d0/12122404685.pdf
    • https://s3.amazonaws.com/punurum/amazarashi_digging_holes.pdf
    • http://bijamujijupife.epizy.com/66564634077.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_off000111f3.bin
79bda482219d4c43e0adfdbcd286d8bb84408a072687502d3a53320bbf6cbf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 5556 bytes
font_01_sfnt_off000124ff.bin
3a3a1658028686a99a67b22c73a0e0aa1a918da370921279de3bd915d99c64a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10852 bytes

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