Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9280a97d7dde8cd…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 00:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: daa681b97ccbfeb7d24f4652a2069650 SHA-1: 213fe53c3564986d9dfe1b55ea80a30b19db4a47 SHA-256: d9280a97d7dde8cdf0b9e1323142b83cf1f762b501f85c78e82022fa92018581
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, appears to contain metadata related to the wkhtmltopdf tool and a specific product name, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=plantronics+voyager+legend+pairing+button PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd175c215fff.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/xebitazutugi-vigikazub-riwanog-rinosokoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_60227797a21ee.pdfIn PDF document text
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/9401356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fcce9f91f739.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/tom_sawyer_island_opening_times.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/79481803934.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/mubuxemapejezaxita.pdfIn PDF document text
    • http://retamos.mygamesonline.org/81433074411.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/meaning_nature_and_scope_of_public_personnel_administration.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/what_sith_are_canon.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/robot_coupe_r2_dice_blades.pdfIn PDF document text
    • https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/tozuvurusele-lomizajilidewaz-zotasatajivil-remakopedob.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/58623995433.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/21163411621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/dd-wrt_repeater_mode_not_available.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/vabibulepotafede.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/a_lesson_before_dying_chapter_5_and_6_summary.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/how_much_does_a_rheem_furnace_cost.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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 5544 bytes
SHA-256: e483a38ebd1896ed4af7209eb1e248473a166eea34183d4aa77ec921b5eccffe
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10796 bytes
SHA-256: ed7b2d5cd89821fe297ec8a07e7e2ae233b7664a1889f2315f6121fbc111960d

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