Malicious PDF — malware analysis report

Static analysis result for SHA-256 954f316a491f0e22…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 17:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e56bf16dbc1d4343e4dcd5f944edb90e SHA-1: e7c910975fb12e6c6fb4d9ba400c82c26fe0715c SHA-256: 954f316a491f0e223df0e67fbfa42fa978576a1d899eb8028d05e4deec1f8de6
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links disguised as a resource for PDF annotation tools. The presence of a PDF_SEO_LINK_FARM heuristic and multiple unknown-reputation URLs suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=app+to+annotate+pdf+online PDF link annotation
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/1991065.pdfIn PDF document text
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/3561581.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/3699216.pdfIn PDF document text
    • http://godubumoze.iblogger.org/47716572421.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/wiiijeA/dan_the_meme_man_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/jjhgeyc/37917961608.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/ghihijY/45436525320.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/WRsQeyI/pastimes_pub_grille_ripon_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dMClgfp/13260566207.pdfIn PDF document text
    • http://wafolifinibi.22web.org/corrugated_tin_roof_sheets.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/fimewalawuzolorure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_9f22e86d63e04626bf337d82d7cb1368.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/559cdb26-f3ab-4d05-8c98-d186d61fada8/how_much_does_a_gas_mask_filter_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733b99b3-eb8c-4b73-a269-79f85e3fbbdf/how_to_change_baby_g_watch_battery.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_b2b825d5cf2b408eb0e80e4ef6dafab9.pdf?index=trueIn PDF document text
    • http://dupetomumipur.rf.gd/relationship_between_ontology_and_epistemology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60c3e88-7a48-43e3-bbec-221f234f682c/ca_form_568_booklet_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652ec3bb-25e9-4d4a-afc9-4895fe519354/kimepuxibuvad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2404df3f-651b-4f0c-a34d-fa56dd238b2c/why_does_my_dog_lick_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48e90f7-ec25-4306-8024-eb9165e18054/pamufenimulejuxe.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/88872858601.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_a6388181e35b47d1a2b04e962f8d4164.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97d8795-0358-418e-8195-ea2211101597/how_to_trade_in_to_amazon.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/21787510611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b547e3-9ec8-477b-a417-2065f1fc8fdd/58434635341.pdfIn PDF document text
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_b3bdff348cb84d8db362f29e405b2fdc.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_4edb0bd3d1ba4d9389f794662690d423.pdf?index=trueIn 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_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 4748 bytes
SHA-256: 1d93bd4dc852f503abc760e4595b49de7e8dd942e807e6f327225d84d288baf2
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11144 bytes
SHA-256: 49d7e69732acabfd6dc2fdc05fef6aa7f02943771a3088851207f19bd986d1cc