Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e315c8c6540f7…

MALICIOUS

PDF

73.9 KB Created: 2021-02-24 06:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f982ff3adafd3665f32380797d9c64ec SHA-1: 912a92e5170697a737468132de3545b25abfa6d3 SHA-256: 840e315c8c6540f7df62230298dd7cb4b3db49d6d3b9ec991f3b98c49f6e3aff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=after+we+fell+release+date+australia
    • http://lulumel.66ghz.com/bosavofovusus.pdf
    • http://juilopkiretlo.ru/337868674331ml8u.pdf
    • http://obschee.xyz/suvevususemuf0ihw.pdf
    • http://bonusiotsbera.online/pathfinder_2e_character_sheet_auto_calculatingvhwou.pdf
    • http://molotkov.site/55153515755jel2m.pdf
    • http://com-free-fire.com/302123375507muon.pdf
    • https://cdn.sqhk.co/rekubapapup/ELjgwwc/jhu_apl_credit_union.pdf
    • http://vilopeg.xyz/chronic_fatigue_syndrome_icd_9j2wks.pdf
    • http://datidino.iblogger.org/4560484608.pdf
    • http://twobigs.space/79204332975smwgv.pdf
    • http://antonioit.space/jasper_reports_documentationu8hrb.pdf
    • http://baffer-shop.space/57046496213wox7j.pdf
    • http://zokorut.iblogger.org/65534866122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kajoxuf.epizy.com/android_x86_houdini_arm.pdf
    • http://xesogopobatobop.epizy.com/792106889.pdf
    • http://bufixel.rf.gd/bakotazoworusud.pdf
    • http://guzimuj.rf.gd/48634264342.pdf
    • http://lulojoduvos.epizy.com/sutoxefomasofokotufidiler.pdf
    • http://vijagomifeka.rf.gd/tagalog_bible_study_topics.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_off0000e2a8.bin
0ff2361009dcab4a351e2b5216a8625d30006cf03028c0bd395836eb00aafd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 4980 bytes
font_01_sfnt_off0000f3b8.bin
9561a68841681b8e6c81f42030cc335490ef5c5768b1c9a8b92de23405892e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 11332 bytes

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