Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19570c5a5ac461f…

MALICIOUS

PDF

77.1 KB Created: 2021-05-11 00:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49127e970bfa2cefdde34d20131e7d32 SHA-1: 2af44b2ea869c0a241ce5edef5a93fdca10b8185 SHA-256: e19570c5a5ac461ffe22a63004f94f1c152cbc96253f90c99da6aa8fc65d80d4
234 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains a high number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document may be attempting to trick users into changing payment details, a common tactic in business email compromise attacks. The presence of embedded JavaScript, though not fully detailed, suggests potential for malicious actions like downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/strik?utm_term=my+nook+keeps+saying+network+problem
    • https://vinifobak.weebly.com/uploads/1/3/5/2/135298549/8fb5cd2.pdf
    • https://lezolofajikop.weebly.com/uploads/1/3/4/3/134353880/tibeluzerezexut-totanimezipin-bevolibekevuz.pdf
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/b338a.pdf
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/f78856915.pdf
    • http://jibakerutev.mypressonline.com/bidevoxu.pdf
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/5399603.pdf
    • http://bifilazona.22web.org/for_one_more_day_book_free.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6016b4e63dc1b.pdf
    • https://cdn-cms.f-static.net/uploads/4426280/normal_5fe7f85501680.pdf
    • http://vofigasu.medianewsonline.com/periodic_table_of_element_download.pdf
    • https://cdn-cms.f-static.net/uploads/4485926/normal_601dd4f798716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f22cc57d-56f3-40b6-b3ae-82b648b2efc1/68319988347.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_377dd9d750de46528a1c904e47941811.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_ef11f48aca794d9291764557fa2449a2.pdf?index=true
    • http://xoxemofunox.epizy.com/format_factory_full.pdf
    • http://pezamax.myartsonline.com/nutrition_an_applied_approach_3rd_edition.pdf
    • http://tubaduk.epizy.com/52887648988.pdf
    • http://sowitid.epizy.com/49653958574.pdf
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_03a1cbc63004495b8b248b8c0b3885e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e80c915b-de3a-4130-baa9-e6972894577e/which_of_the_following_are_plant_assets.pdf
    • https://uploads.strikinglycdn.com/files/90189b99-6dbe-4790-8dac-5dba8eef22f0/what_does_pin_mean_emoji_mean.pdf
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_abe4183a1e204665a564d75b5e75ccc9.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_bcc16bc6458748669f90cc3ef04a6478.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f29f5cc-1726-4061-a723-2b92ceb00e32/what_is_portrait_mode_in_photography.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebf.bin
751a69b46c4bb0faa69d984bad16bc75f2577592115b0c6d6c26e0840e5cf3c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 5540 bytes
font_01_sfnt_off000101a9.bin
63e38b2e5c4dc7709fbc5cf5f0ca5e7632a5308ca0f74dcf9f2035c411f17662
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 10916 bytes