Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e835875a9b51b0…

MALICIOUS

PDF

83.9 KB Created: 2021-02-20 21:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7ab9377fac0b756998cf8045954ca25 SHA-1: f69aad6aec4e324f93f2aeebf73830a210734b6b SHA-256: 84e835875a9b51b02307fe4a49e72688dccf87aed0734249117bdc25d7ca7164
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://jacksth.ru/strik?utm_term=battlefield+4+reloaded+update+size', suggests a lure related to a game update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site that serves a malicious payload.

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/strik?utm_term=battlefield+4+reloaded+update+size PDF link annotation
    • http://fortuneo.biz/thooliyile_aada_vantha_song_downloadqjq33.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/satoni.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/hdjffie/ted_baker_glasses_review.pdfIn PDF document text
    • https://sobapaxuxax.weebly.com/uploads/1/3/2/7/132740961/luxewipad.pdfIn PDF document text
    • http://erogan-columbia.site/fenodopebilejerdbazj.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/lhBidDD/simply_8-_bit_icon_pack_apk.pdfIn PDF document text
    • http://urott-hu.com/lupedemipofuqacz1.pdfIn PDF document text
    • http://hookup666.site/56879497463x9w1x.pdfIn PDF document text
    • http://goshop32.site/vupimaremuj3fclc.pdfIn PDF document text
    • http://temppicture.xyz/faredamidozinizoloxepadzjd9.pdfIn PDF document text
    • http://exampl1214.com/conan_exiles_best_base_locations_pvemnscd.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/aha4Kkg/43988776349.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/gfih0hd/zatofi.pdfIn PDF document text
    • http://ncrypt.in/folder-Ubgui21ANETLOADhttp://ncrypt.in/folder-waCRjYFBSHARE-ONLINEhttp://ncIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wulagaw.rf.gd/brother_pt-1280_tape.pdfIn PDF document text
    • http://xojorefalez.rf.gd/bethesda_bug_report.pdfIn PDF document text
    • http://wulevizoreb.epizy.com/kuvugozut.pdfIn PDF document text
    • http://zanebinelit.rf.gd/32052747190.pdfIn PDF document text
    • http://nipopuledi.rf.gd/yanmar_2gm_fuel_pump_replacement.pdfIn PDF document text
    • http://besipopi.epizy.com/33392762645.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://www.gnu.org/licenses/gpl.htmlIn 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 5220 bytes
SHA-256: 95210e94b33c90369d7426162b74dfbc1381fefe6edac812849a66e00a232dd8
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 8040 bytes
SHA-256: 9c0143cca9221a97712e6eb546621f021ee1ed463b69cbf6e95df2ced8e45f4f
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10820 bytes
SHA-256: fe6112be0214080f19b92066412b79c4509f10946e124c0b7e491d8106f722cf
font_03_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 17024 bytes
SHA-256: de9058a286c628288fbcc0f4949e310578136dd275e2fd42f7e06c63d359a267

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