Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb613ab5afb86e5…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 02:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d591d63df771b965ec1b8fea127cd05 SHA-1: 20404469be1dbea8de1e681b10fb7bcb8e6ec1ef SHA-256: 7cb613ab5afb86e5ac6a66926fc2ab6bf4bc6186e28801e0108a376803c7333c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise. The presence of ML and ClamAV detections further supports its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://xezojetit.ru/strik?utm_term=how+much+does+youtube+pay+1000+views PDF link annotation
    • https://renuzazofijixi.weebly.com/uploads/1/3/4/8/134865573/nanulatiwerozis.pdfIn PDF document text
    • http://roflan.site/16828860732f1z8g.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/gqSGcSV/traffic_go_kart_racing_3d.pdfIn PDF document text
    • http://prosucre.pro/votupk9nuf.pdfIn PDF document text
    • http://alex-chekalev.com/519713867839t7ce.pdfIn PDF document text
    • http://myyshooop227.site/286344884383lrru.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/05ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/ghdgiF3/41041239835.pdfIn PDF document text
    • http://iuts.space/linkers_and_loaders_bookmmpx0.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/bada05bb97.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/9oibDij/fomivalapov.pdfIn PDF document text
    • http://forkidsshop.online/are_cannon_gun_safes_any_goodm3gbe.pdfIn PDF document text
    • https://mosaminaworite.weebly.com/uploads/1/3/1/6/131636744/talivutijezobobipuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ff8b7765624e.pdfIn PDF document text
    • http://gouliwer.online/what_is_a_reproduction_of_a_paintingnnfj3.pdfIn PDF document text
    • http://216tilford.com/what_order_do_the_fantastic_beasts_movies_go_ine00tl.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/7eac105fca46b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600be41c150d3.pdfIn PDF document text
    • http://voiprormul.xyz/adoptable_storage_apk_lollipopa3bxr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_7a1a117eed1d428a8e9a7060e681dc27.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_bd68130d54334e21b48c85fb27e49bd2.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_a533709458ee4860bbd22a4370b13a6e.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_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 5732 bytes
SHA-256: 7a2ccbb00cd7117ec60f3d54657c847eb1b2b3fc2c44ef62e28d67a0ee59cc99
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 11440 bytes
SHA-256: e2ce73fcacc3e2961d53e10ff5e6847c87de95c9535d8b2af5fef7b07a375866