Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1e03027ea4255b…

MALICIOUS

PDF

83.1 KB Created: 2021-04-08 20:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbaf538e9b8ec7f0507923745fc1510e SHA-1: d28c20663d9eee41b463441ab678c06394fc3f23 SHA-256: 4f1e03027ea4255b85d8337d9df2a44c1aa9825ffb0862a72ee458c01593f663
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic suggests a phishing context, possibly related to fake billing or support scams. While no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics, along with the ML and ClamAV detections, strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=craftsman+electric+staple%252Fnail+gun+easy+fire
    • http://zelopaqq.xyz/league_of_lords_show_castvnlg3.pdf
    • http://helen-art.ru/how_to_do_needle_maintenance_on_a_keurigadky5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_6b001675fff242499134450b874e2717.pdf?index=true
    • https://uploads.strikinglycdn.com/files/17c5d03c-2c2b-4bfb-b025-f744b5de83e5/62939949664.pdf
    • https://uploads.strikinglycdn.com/files/b9c4881f-217f-44e5-81e4-131d3f6b227c/thinking_and_destiny.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_916e00c915644e13a627506f0d2fcae3.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_03f384ff91804444a18378cc6a44bd1f.pdf?index=true
    • https://s3.amazonaws.com/padadutiseni/77914221165.pdf
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_584323713504499e91a3803a3bb1868c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77bc6c08-f917-402d-9e8f-1fe19449b316/ananda_vikatan_latest_news_in_tamil.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_234b8f10a1d64c50b7804fcffffcbc06.pdf?index=true
    • https://uploads.strikinglycdn.com/files/562a69ff-e553-4c65-8d71-0a0becf1b1f6/16148987601.pdf
    • https://uploads.strikinglycdn.com/files/17ef72a6-cc91-4d10-a4e0-31217ef8161c/crochet_hat_for_baby_boy.pdf
    • https://uploads.strikinglycdn.com/files/731c35c8-4f88-4858-bc8f-fd196ff8b409/fabuxanalozuvipegerujisa.pdf
    • https://uploads.strikinglycdn.com/files/5755b8ea-1352-4492-b06e-4b78c3728c56/captive_prince_damen_and_laurent_fanart.pdf
    • https://s3.amazonaws.com/fakuguvil/what_ingredients_do_i_need_for_my_bread_machine.pdf
    • https://s3.amazonaws.com/fatikonavori/hangaroo_answers_biggest_mountain_peaks.pdf
    • https://s3.amazonaws.com/xarojapi/vulafofibinetifanev.pdf
    • https://uploads.strikinglycdn.com/files/60c57770-3b7d-41f9-bb3d-c6486e9cc21b/schwinn_570r_recumbent_bike_review.pdf
    • https://s3.amazonaws.com/sazixipame/luvapupajulu.pdf
    • https://s3.amazonaws.com/xakusineba/jazakotasemunevusipo.pdf
    • https://uploads.strikinglycdn.com/files/bb91a67f-aab2-4243-bcae-070810636d6b/casio_fx_300ms_plus_vs_fx-300es.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_off00010664.bin
afab823647b5953fbec07f85f1871fcae1ba7c1a4fe031ff803231a593b2953e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5380 bytes
font_01_sfnt_off000118ad.bin
b1734d2e634425e9c5be9ea4eec7265411b7e7c379938af7347c68b292131e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 11172 bytes

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