Malicious PDF — malware analysis report

Static analysis result for SHA-256 691d5a5ac2790d47…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 19:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d93e06b08316a3c8292bdbfca8c44334 SHA-1: b778119988d5cb5fd1b5795fa35906cb3b31df30 SHA-256: 691d5a5ac2790d47c4993512a3736e008c86edeb47cd688838ce3b05bf9b122f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of external URIs and the structure of the PDF point towards an attempt to redirect users to potentially malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=brahma+purana+pdf PDF link annotation
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/gulevopobimatusixuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/ShdEvTP/mirage_memorial_global_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/dovutiwabule/aQNcAij/verarokifozosulekiwupe.pdfIn PDF document text
    • http://remontvorot24.com/android_pie_on_vivo_v9dm46a.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/7hcgfhf/crazy_taxi_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/i7ogc4l/nepelejoz.pdfIn PDF document text
    • https://gijopufiri.weebly.com/uploads/1/3/1/3/131384250/e4cd337.pdfIn PDF document text
    • http://fb-pageunderreview.com/sajirakitexololotupomy7ssv.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/getanasa_sokinofajaser_timafas_girugipofemave.pdfIn PDF document text
    • http://magicwoolshop.com/domunipew3kcbq.pdfIn PDF document text
    • http://poradoit2.site/fulusrzaff.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/ojbgjQs/family_farm_then_and_now_story.pdfIn PDF document text
    • http://changely.club/walujhqab7.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/1Ou7heK/78741907268.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/50OgfDZ/86679384994.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/brucellose_traitement.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/mUijCFK/duck_hunting_kayak.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/34362819103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/26585794241.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/98970153898.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_4c8bfa20bfe4461bbb9bb5d830e4b026.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_32d3d92efdb348758db23fa746263212.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_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 5120 bytes
SHA-256: efeb380b6e51e4be38a4cc3415933de4e5ccc27713c392a22057b7f61f4449d7
font_01_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10472 bytes
SHA-256: 314a9952bf68b6cc88a5ecf852053ea92f8f32b96aaf49d821dc8cc7b9b2dcd0