Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49a84ad64d8f73c…

MALICIOUS

PDF

83.0 KB Created: 2021-03-02 15:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6599492d04fc78bd4b9b52909a18b2f1 SHA-1: e3a40ea4f0bf9e4832ca998480d7c52475bd1a76 SHA-256: f49a84ad64d8f73cba55921e5942c47783a7cea77b142c4ea8046d8a0fb59450
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm and an MFA lure. The embedded URLs point to domains that appear to be used for hosting phishing lures, specifically targeting 'yahoo mail login forgot password' scenarios. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites for credential harvesting.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://golowaki.ru/wix?keyword=yahoo+mail+login+forgot+password PDF link annotation
    • https://cdn.sqhk.co/masamiwe/5GJheLG/plunder_pirates_mod_apk_3._6._1.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/jiajhii/beyblade_burst_rivals_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/ajc8gjN/paypal_donate_wordpress_plugin.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/Jjegjid/pulse_ox_levels_normal.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/FhaihE5/throne_of_glass_series_tv_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_6023d07232fb8.pdfIn PDF document text
    • http://lutusogugifuj.iblogger.org/dedasogupava.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/SJZCjgn/pokeball_plus_does_not_charge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_60342b6f8358e.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/ajbhbge/sidureziwezegedosufab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vidobif.epizy.com/24131995081.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/21874338422.pdfIn PDF document text
    • http://jefuxod.epizy.com/zapiwuf.pdfIn PDF document text
    • http://filirepakej.epizy.com/18068774880.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/hagerman_idaho_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/89256979724.pdfIn PDF document text
    • http://wogukakof.epizy.com/longwood_lake_oak_ridge_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/tamilrockers_movie_application.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_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 5180 bytes
SHA-256: 74275869d10ef95a71b0aee3b80c06cced09c520c48291463376e9d6f965556e
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 10240 bytes
SHA-256: 4bebcd0cc64f5d59f39ca0662975c31816189b2048691cd091c2629990b848de
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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