Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c076725797936d2…

MALICIOUS

PDF

84.4 KB Created: 2021-04-03 09:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78a8f49006b0f3801b3f147a22171a7c SHA-1: 883fcba5d8a738c148a0751e3f975dff55d05d12 SHA-256: 1c076725797936d27552bd3ac94c6853e1d6534d2c1c242524da79f45862a45e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/123?utm_term=peptide+bond+formation+is+a+hydrolysis+reaction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384320/normal_606597ce25603.pdfIn PDF document text
    • http://limons.space/bekhayali_mein_video_statusbna8v.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/jeiiiiS/crazy_dino_park_epic_eggs.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/1403158.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/bibDf2z/14751802654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6067d6910829c.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/fhfjiWa/espn_nfl_power_rankings_week_3.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/6322730.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/jjjcbiw/rummikub_board_game_how_to_play.pdfIn PDF document text
    • http://lisolu.org/41409377841s12ec.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/4hdjjvh/zotideb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_601c700e593d0.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/fbhJMST/32471526102.pdfIn PDF document text
    • http://sodalabs.club/gamitibuzulomevobimkm3ew.pdfIn PDF document text
    • http://topsale.pro/shiva_panchakshari_stotram_lyricsqb9k5.pdfIn PDF document text
    • https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/tonad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_6043f19504a3c.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/ee659648db81897.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/dieibDc/starz_30_day_free_trial_hulu.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/1434614.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/e6jija3/snapseed_editing_software_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasalifadipu.epizy.com/4741498861.pdfIn PDF document text
    • http://valajawegob.epizy.com/sipagumixetoj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 5640 bytes
SHA-256: 00062a24118cdb15cc78e83421e4cdc89d41ea0dfec02cf8a98d6d13e6111741
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 12328 bytes
SHA-256: 9d0e59c6e41b7b4e907d4d24f284741deffb48c929f18ff9b2b99f27fc1e2ceb
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 16268 bytes
SHA-256: caa307235f9f20d306118058150a8dad7285964b412c6b582cbe2c94f43387cf