Malicious PDF — malware analysis report

Static analysis result for SHA-256 8184c4b165a16f85…

MALICIOUS

PDF

180.0 KB Created: 2021-04-26 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb20cac33ce5c21a66a7c10c28f817ab SHA-1: 90841ab18703eca846773c2c5f79676911da4485 SHA-256: 8184c4b165a16f85f00451898882327b6cee7143bc1e662e8ca90e2d8e3f1dc9
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=contemporary+intellectual+property+law+and+policy+4th+edition In PDF document text
    • http://fasadi.site/77924632693q7r0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_603d3bd27cd58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5ff41218842f5.pdfIn PDF document text
    • http://jelesanu.iblogger.org/99376262871.pdfIn PDF document text
    • http://oneitstore.info/miniature_dachshund_puppies_for_sale_augylqx.pdfIn PDF document text
    • http://chtotakoevuxom.biz/how_to_find_a_rent_controlled_apartment_in_nycvz3le.pdfIn PDF document text
    • http://iglivesupportteam.com/ashok_leyland_dost_plus_brochurei9ggg.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/ekeSUgf/soap_increase_timeout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_602c6cf60f3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_60386a7f11e65.pdfIn PDF document text
    • http://zupinuxuxodu.iblogger.org/narorusozid.pdfIn PDF document text
    • http://deutschebank-meine.com/mexotayz3sz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_6024c0b0b4454.pdfIn PDF document text
    • http://parralax.net/jemukiivdmv.pdfIn PDF document text
    • http://pubggaming.online/aniseed_balls_nutritional_information7yets.pdfIn PDF document text
    • http://siteznakomstv69.space/marujajak9lw.pdfIn PDF document text
    • http://xekisegofisupo.22web.org/sharp_aquos_tv_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/cCghgfh/wow_classic_alchemy_leveling_guide_alliance.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/train_simulator_pro_2018_mod_apk_android_1vns2s.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/hbjdiir/natural_nails_nail_polish_ideas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kafupepizaji.epizy.com/fenafenipiroteni.pdfIn PDF document text
    • http://wigifanike.epizy.com/vawibutotomoxizavalulona.pdfIn PDF document text
    • http://bamasagure.epizy.com/80356427114.pdfIn PDF document text
    • http://toxodetu.rf.gd/6751253736.pdfIn PDF document text
    • http://kimufigekufeta.rf.gd/mirojilapifibumipipiwu.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2647B 4984 bytes
SHA-256: 22dc86bae07400070c39c20fad8a842bdf0776ebed91f8debf0921f31e48aecb
font_01_sfnt_off000275d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x275D1 5324 bytes
SHA-256: 97811194824237a73926f605e3603c3e52d45ef3a358f6dfe6de5f479ad85ebe
font_02_sfnt_off000287d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287D5 12492 bytes
SHA-256: e407d0c799db551a7984e789739c412b8ada85ed8ec2b43808f04dff4a0e0729
font_03_sfnt_off0002b242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B242 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361