Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6443e5d4b3939f…

MALICIOUS

PDF

89.9 KB Created: 2021-04-29 10:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b66e477e4b3c0264a25195a24eba6e97 SHA-1: ce3666d879fbdff910efadfe87f3fa81fa2a8761 SHA-256: 6c6443e5d4b3939fb9fa0fdc388252684493b410ef3881b90c805febcc0591f4
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a prominent one being 'https://golowaki.ru/strik?utm_term=machine+learning+best+books', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. ClamAV detection and ML classification strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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=machine+learning+best+books PDF link annotation
    • http://relodifalixogo.scienceontheweb.net/barrancos_mooney_descargar.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/coronary_heart_disease_review.pdfIn PDF document text
    • https://rujapunilibufig.weebly.com/uploads/1/3/4/7/134713438/5539778.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/how_to_maintain_daikin_air_conditioner.pdfIn PDF document text
    • http://thepropheticapp.com/launch_trampoline_park_watertown_hourslu28r.pdfIn PDF document text
    • http://csxmoney.info/it_chapter_2_stephen_king_cameo0tt5b.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/atresia_intestinal_en_pediatria.pdfIn PDF document text
    • http://onsideball.info/list_of_prefixes_and_suffixes_in_englishv2t8z.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/54667587429.pdfIn PDF document text
    • https://jefefobivepofo.weebly.com/uploads/1/3/4/3/134373202/7898218.pdfIn PDF document text
    • http://uablog.website/48699378758q9oe8.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/2471837.pdfIn PDF document text
    • http://lamovingcompany.com/9276499480lywjw.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/zokirefojebijitoji.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/605ef5a5-84ec-4ba3-a510-9d45e68db982/74421836390.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/costco_membership_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d9c63e-1584-43c5-970c-39c5d525d820/the_wanderer_song_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617f6eaf-21be-4f47-965f-19bf1f495aa2/62471561987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f15dd8-fed6-46ab-b701-8f0a0f240eaa/sims_3_64_bit_not_working_with_expansion_packs.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/mufufoga.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/durga_saptashati_stotram.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/voromegefevan.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/mumifoxunibulitigagukiwi.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_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 5268 bytes
SHA-256: 28a8f88f5cae5803849008e9231478c6c02ba30852799035a5161eebbb30dc17
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 11260 bytes
SHA-256: 92e7118e20ac9c3eb20c7762a2eec3f2e42ddc9ed650f5fe9b7ba5465c706d10