Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26dcc1ef0e3dd7d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 20:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0792d55c0062ea7fe00aa316631b7588 SHA-1: d9313b96a40e00b0eb10b84ee419b5ba4dd54d7d SHA-256: c26dcc1ef0e3dd7d2c91198f15165daa2e447950278fdbde633e2f0daffb4a79
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=frictional+force+experiment+lab+report PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/ghigfib/dupumunese.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/8271825.pdfIn PDF document text
    • https://kesakoti.weebly.com/uploads/1/3/1/0/131070149/zogiwipadarujivikal.pdfIn PDF document text
    • https://cdn.sqhk.co/valumikeg/jhjXiaN/bmw_x4_spec_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/8QicLje/51759338567.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/t7Mgfhh/terewemojix.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/3406928.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jjUgiOL/rimufetukimelirewonigij.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/cf0mihd/go_fish_restaurant_mystic_ct_menu.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/5640316.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/igjfjg8/ielts_vocabulary_words_list.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/bezetumuxefunukeziv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_59a83bdc5f2548d6a0fe476bb930aabc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbb61c2-3512-4b30-89c2-784dd0c8b3b2/math_olympiad_books_for_class_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40599de3-cccd-4308-b6d5-997bccd681d9/kepikiz.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_6f44c795989a472fbce6f2e6f844d6fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58140109-ec62-4971-bee1-72473a33752b/21832478111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff01d6-99df-45c6-9f13-3765b1e5013f/88264412100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebfb363-cb86-4f97-99cf-8772e376c6f3/harry_potter_and_the_sorcerers_stone_book_pages.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_7c610d77484447c988620cba6a3081b7.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_76da3a1e957945d3b9c6bd160b10e5af.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_ddaec692e9784cd6ab6bcf252fb75408.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_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5144 bytes
SHA-256: 4194886754c7731168c878a339352d484ec16770eefea51164167b31d3a0c29b
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11336 bytes
SHA-256: 3e55ab919dfc6e73dcc3437c608deed7bd41147aeaea98044619c621eaff6023