Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9688cb02cc2c40…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 11:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da60eb52cafc7bd50e27811d2d6a5c71 SHA-1: 136ec490c051dd394ac55113b7cd064d9fed82f3 SHA-256: 9a9688cb02cc2c403496a73656c81feeb631c55a26f99a9d9b038fcb38df8c42
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a critical finding of a link to known malicious redirector infrastructure at 'https://crophysi.ru/wix?keyword=mobi+for+iphone+gift+cards'. The document body, though heavily obfuscated, suggests a lure related to 'Mobi for iPhone gift cards'. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/wix?keyword=mobi+for+iphone+gift+cards In PDF document text
    • https://cdn.sqhk.co/kuderoxuz/XjigbG5/roly_poly_monsters_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/ich3jiP/dufojuwexofezaxuju.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/lojotumuf-paxerikot-miliji.pdfIn PDF document text
    • http://sepibuzare.22web.org/12239542976.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/vazoga-guxad.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/CheYvig/odd_eyes_revolution_dragon_rotd.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/f7ge5hb/59760934707.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/senevokozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_60301c3ac0b61.pdfIn PDF document text
    • http://ravapusevuj.iblogger.org/minecraft_skyblock_mod_apk.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/vagesaxisit.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/QiiYjfs/lofovaxabogos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokudapele/sadunabibi.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/kafisuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/48923032932.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/5642474430.pdfIn PDF document text
    • http://fudotebu.epizy.com/19596244566.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5532 bytes
SHA-256: 2fec3176488c727834841d905c833a2755e6f01f8a056efa5a9a360b90d22e25
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 10492 bytes
SHA-256: d73dfa1ba580c9d383090b42d1ea1fd9547ae5700faac4250e33c26e3e8409a0

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