Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b8006aea7f14aa…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 21:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ffa04a0755a15d9f0f9798672f0a871e SHA-1: b237a0376b7c8f9a191ab830fbc5c19277b69edb SHA-256: b9b8006aea7f14aaf478f462d2dd561172520ae6e8f91b574b70cd3baf96ba76
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 0.9956

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://jacksth.ru/strik?utm_term=friction+loss+per+100+foot+fire+hose PDF link annotation
    • http://ezfix.asia/college_application_checklist_form6thkb.pdfIn PDF document text
    • http://vusejulene.iblogger.org/percy_jackson_the_sea_of_monsters_chapter_11.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/ggsQtic/90435121703.pdfIn PDF document text
    • http://creamwalls.online/traffic_tour_2020_apk_day65aky.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hfJhjNd/33949099253.pdfIn PDF document text
    • http://rte-ita.fun/what_is_the_bolt_pattern_on_a_2015_jeep_grand_cherokeejdfu5.pdfIn PDF document text
    • http://tugrull.com/hero4_silver_vs_blackiwj5z.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/3hfHje4/hit_or_miss_meme_sans.pdfIn PDF document text
    • http://trysol.xyz/ge_logiq_7_user_manualoa051.pdfIn PDF document text
    • http://meetchambre.xyz/junaxulejuey86p.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/fgg1Fja/36110250124.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/jfoArhe/pioneer_sph-_da120_update_2019.pdfIn PDF document text
    • http://wiwusigeronisu.66ghz.com/puborefusufawo.pdfIn PDF document text
    • http://helpforteam.com/kinawixepuwowigomepegabk9hrt.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/fgjjdig/nail_art_online_shop_south_africa.pdfIn PDF document text
    • http://idealica-it.website/photoshop_cs6_extended_tutorial_for_beginnersc9459.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/AjcGhhh/nisimakijizawuniva.pdfIn PDF document text
    • http://nosaxumuv.iblogger.org/amebiasis_gpc.pdfIn PDF document text
    • http://uablog.site/fimuniludipozur7g30.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/ic0iia2/sulenob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_8f4903057ee04a74ad288ba3d25d7631.pdf?index=trueIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_9a8db374dc32428da9a66f013aad9af7.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_e3ab7406e745443d93d05b005c4ab61c.pdf?index=trueIn PDF document text
    • http://mowigefugitixa.epizy.com/piano_sheet_music_easy_free.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_fc3820de5ccf41b8a5c94e0f80b49a0a.pdf?index=trueIn PDF document text
    • http://vagakidid.epizy.com/how_are_dividends_paid_to_stockholders.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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 5040 bytes
SHA-256: 175bd32d6c5192c0805d8aee846eb278e5f0ec794dfbfd7c9ffe4be5db245304
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10620 bytes
SHA-256: c8bd0ae4f81f0e30520507f4d5abcf18fe7dad68834ebd5065b4db28e4488842