Malicious PDF — malware analysis report

Static analysis result for SHA-256 a442acca0850dd1c…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 19:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 51a7d1b834983cd525858ab2e4539904 SHA-1: ec25a7fd4fdbefab3bed26b86f09a2a5f918a604 SHA-256: a442acca0850dd1cc38eb06cef4d767d4219ac04fb8ac8dc7ea3afd61dc83b6e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple external URLs, one of which is presented as a download link for a 'cashflow game' application. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into downloading and then decrypting a payload, likely to evade gateway scanning. The document body is heavily obfuscated, preventing a clear understanding of its specific content beyond the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/123?utm_term=cashflow+game+by+robert+kiyosaki+apk PDF link annotation
    • https://mivatuvogap.weebly.com/uploads/1/3/4/0/134040868/xutesirazivini_pexuwugatid.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/2b0e0307ffc.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/pikuzufopawefekumexisi.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/jidoworas.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/89866821957.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/65702871859zb309.pdfIn PDF document text
    • http://takipleskazan.org/anthony_giddens_sosyoloji_kitabeteyt.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/firmware_dd-wrt_no_roteador_linksys_wrt54g_v8.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/dghO4jg/mepasaturulasizidogodek.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/m4Uhc0e/bogab.pdfIn PDF document text
    • http://itawomen.fun/bootstrap_checkbox_form_validationmc3nz.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/solorulofef_bosebukunap_bedumuze_wojiwof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supuwevul.atwebpages.com/designing_power_amplifiers_stephen_kamichik.pdfIn PDF document text
    • http://xamopalamusep.rf.gd/uidai_aadhar_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3042c318-9008-4ee3-8414-30fdd9c62f56/hornady_reloading_kit_ebay.pdfIn PDF document text
    • http://tifureboriva.epizy.com/27508645515.pdfIn PDF document text
    • http://mapureju.epizy.com/armani_suit_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2bead8-a91e-446c-9510-d9712c6ccaf0/cobra_148_gtl.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 5620 bytes
SHA-256: 9c34bd743d0d50029d9197b4f0c815f400881a7916430107204ab3e10dbceb57
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 11900 bytes
SHA-256: bea5c203f7f4aaa2119316d9df56b6a3547b8de5229cb314f4f00427def3ed77

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