Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67a1034b9c523fe…

MALICIOUS

PDF

84.9 KB Created: 2021-04-25 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d6588c3c1d7b275a1bc4ff5493ee710d SHA-1: 04dd684eb6e8c1827de695c6edc690c999f3d11e SHA-256: c67a1034b9c523fe457caa4a50f3e0d12397c5efd90c70e57774d40ea65eb9f0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=how+to+get+dlc+characters+in+jump+force+for+free PDF link annotation
    • http://fragcups.com/does_black_tea_flatten_your_stomachvyg5q.pdfIn PDF document text
    • http://bupro.asia/wakefojatokupadavaboviseg2rru.pdfIn PDF document text
    • http://front-glass.website/codigo_penal_militar_colombiano_20157c2rp.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/limowobepetimipafabug.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/lyrics_justin_bieber_-_love_yourself_official_music_video81tkj.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/mezekimogutebozeziv.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/jegasafanoxubal.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/candlestick_livro_gratis.pdfIn PDF document text
    • http://maykistore.ru/les_misrables_2019_ending_explainedl5owg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1747f045-42ec-4783-9fb3-e70ac5afff08/98270647061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63c4d1d-50f2-43e1-9d4f-830c029ed4df/brother_hl2170w_paper_jam.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/clean_eating_easy_meal_prep_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/regedafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0689650-93ea-473d-907e-0ad083d7d09f/sojudejulekis.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_cf74ef198811469aba30498ea993c18a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6e61d7-6c1a-487c-a804-cd1178b74372/how_do_i_fix_my_range_hood_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9487b595-3517-4d0c-8b6e-4ebd694796eb/what_do_you_mean_by_computer_network_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1d8f3c-1877-4609-9bc5-8683d03e21dc/wifijotuj.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_b0789b94be0046adb32605dcfbf384a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4472b124-043f-48a9-80ee-5ec9c057b2cb/what_is_the_next_book_after_the_son_of_neptune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58c66a5-85e7-4de1-9123-99da2510623e/miruboto.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_da2409b4836c4559b790885e78f39080.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffa572a-585c-49e7-8051-6f0ea6018785/xixopenobiw.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/beyonce_dancers_formation_tour.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_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 5696 bytes
SHA-256: 02bdb875dcb51b8148c608325247e1821ed071f83232d08e1721d62a63bc718f
font_01_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 10912 bytes
SHA-256: 694259579f5bfb2a5c103f61f7bc1da79cbac262864b573a3a0cee48d4440299