Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccc328e99f6aecd…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 06:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06b8a4c70cc99eb84f7405bc2fd447bb SHA-1: 153fc98133e20e11d74442a816ea350e40f84222 SHA-256: bccc328e99f6aecd739876ceb2e2f0640c005697102852cc86435d51c012288a
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://crophysi.ru/award?keyword=immunization+schedule+table+pdf PDF link annotation
    • http://jabilevij.mypressonline.com/sofekutowevezuzez.pdfIn PDF document text
    • http://netlysy.online/the_entrepreneur_roller_coaster_downloadp160r.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/xabupurixikajep.pdfIn PDF document text
    • http://lovelyhouse.online/64077055241kp246.pdfIn PDF document text
    • http://cardioactiveufficiale.site/probability_ncert_class_9n7hdo.pdfIn PDF document text
    • http://reliables.ru/idle_monster_td_mod_apklg5yf.pdfIn PDF document text
    • http://xajotupefaku.22web.org/69911700612.pdfIn PDF document text
    • http://alphabitx.com/yamaha_ypg-535_review9xn71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20684f9f-149a-4028-aca4-4e845d7cb99c.filesusr.com/ugd/87b9a8_7e08d8d089344dcea70a8ce878036b58.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_e4715bd1b48a4bf083a40de9e44db87f.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_dd6b658d91f6470d8450ae891aabc417.pdf?index=trueIn PDF document text
    • http://pujekejiwevote.epizy.com/b_s_letter_love_wallpaper.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_13657d48d88c4c059303c70ce4b804b4.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_06393618e8214c3db4ba55f21de1ad3e.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_cab8573062454dc09e015efb6caf40d4.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_445da4ebfa38488699766747bed7fee5.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_0298fa60e9834d279acc56e49ca1b748.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_2405238688454441bccad5c47fc45777.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_a0db418117ac4874b1b11324c951fe42.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_4818825f4d1b481db9ad15538b6a554d.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_eb6558289a7449e2b58f25b6ddf8e73c.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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5424 bytes
SHA-256: 953819809a0d0588f8bd01a9dd2f64d01db92abd198a81a0eaad44a7717e05f1
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10336 bytes
SHA-256: 26eb4a76a43a7145178eb1af4ef0d284e6a42a4e306d9e13476307cfe01bdab0

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