Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcef72fa001b6e66…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 14:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2cf38963b2f28404b4dccd04ab02a667 SHA-1: 5c71cae0163e46dc9b6e63380aaeeedf7555661c SHA-256: bcef72fa001b6e66cbc57b490597987430599342066b9216d6a4bf82353dc96e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to external URLs and application metadata, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=what+brand+router+does+centurylink+use PDF link annotation
    • https://cdn.sqhk.co/fedelubu/hbVKYhi/escape_game_50_rooms_3_level_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6021948778d50.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/eibwhf3/busomezavarefiso.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/bbfNoqx/fuxiniwararegaxurek.pdfIn PDF document text
    • http://creamwalls.space/badlapur_full_movie_hd_mp4f59nn.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/c37fc2fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_5fe790019343a.pdfIn PDF document text
    • http://aycotoro0.xyz/elements_of_airplane_performance_g.j.j._ruigroksijdo.pdfIn PDF document text
    • http://sport-stavki.fun/nodezijiponuxadekokekugokmtk8.pdfIn PDF document text
    • http://meetchat.space/98102368890x80pe.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/dopajuvajapogib.pdfIn PDF document text
    • http://8gusevshop.space/matematicas_5_primaria_sm_solucionar4yqw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601b986356bdd.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/c7gcOia/frag_pro_shooter_gift_codes_2020_november.pdfIn PDF document text
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/dilajevuretona_givosevokaz_wadotoxuf_bexunifilaworog.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/5550107.pdfIn PDF document text
    • https://watuluvijigu.weebly.com/uploads/1/3/3/9/133997483/linajogoba_fojobozota.pdfIn PDF document text
    • https://telazavax.weebly.com/uploads/1/3/4/7/134729689/56be2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 5348 bytes
SHA-256: 5f99cb633df5e8ac135fc9bca7444e18f6e6d5cd5d92df5638046f884518d624
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 10816 bytes
SHA-256: 44b2fc7e26080e23f3d04f11a114433e17aa98cfdb00452015b0b161af0601d0

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