Malicious PDF — malware analysis report

Static analysis result for SHA-256 365c99788ce02e60…

MALICIOUS

PDF

75.9 KB Created: 2021-01-31 03:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06d9d7f85d672d0d12d6b6d259c6f899 SHA-1: 723d4a56340c9e0649ea1d90ab580b37cffba87f SHA-256: 365c99788ce02e60f83b3f4bbcdec815fec3c5152883888698d7fe5a79c739b8
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with critical heuristics indicating it links to known malicious redirector infrastructure. The presence of a 'download button' heuristic further suggests a lure to download malicious content. While no scripts were explicitly extracted, the PDF structure and linked URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wb?keyword=siegefall%20apk%20mod%20offline In PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WAjIcgj/negugirefedet.pdfIn PDF document text
    • http://damodudajipofem.22web.org/bengali_film_protibad_video_song_free.pdfIn PDF document text
    • http://nyvelsets.online/economy_toeic_1000_rc_vol_5g0x8k.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/UzzHQKK/dragon_quest_viii_pcsx2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_6009f3037a439.pdfIn PDF document text
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/zumibuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600fea1ed9c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_5fdc54d16e16b.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/ggnjhic/40036205211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5ff67fca21d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5fc9316ac9f49.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/cxODhpo/limidupak.pdfIn PDF document text
    • http://healsmall.space/xetegazuzanaripiwapuf80vkl.pdfIn PDF document text
    • http://kuzojud.66ghz.com/lifozelulavaxaginimewusob.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/7692528.pdfIn PDF document text
    • http://verification-help.business/45910176842dut3e.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/pejezumozajev-xavopujinesesag-vevar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fdd388573554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fdb29d086cf6.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/fgdSge9/dusakarudozukaledivoxa.pdfIn PDF document text
    • http://scandisvet.ru/43338637085d1wzw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posijibanif.epizy.com/16699251482.pdfIn PDF document text
    • http://vegewamofuxa.rf.gd/play_chip_s_challenge_on_android.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 5256 bytes
SHA-256: 8bdb1f06bca4bccf912deb6713bc1fe7fc4a80e14af62a1f2c6560e2b03d5718
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 2116 bytes
SHA-256: 33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9
font_02_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10928 bytes
SHA-256: a2b29be3d45b2248d795787b9cc64ecae0f547554e2c52f9fe4182749c6cf8bd