Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fa40c83377c631…

MALICIOUS

PDF

79.3 KB Created: 2021-05-07 00:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d0b391ec58cb572f3d46b14579c13af SHA-1: d537ba58a0fd4204bd66117cec6755c761921b45 SHA-256: c2fa40c83377c6316e8cdbabd81cbd8c3762d08664ee7732e6fd8d2df1b913e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, potentially leveraging embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=bushnell+scout+1000+arc+battery
    • https://xafadefuvabajil.weebly.com/uploads/1/3/0/7/130776308/91dd67eb.pdf
    • https://cdn.sqhk.co/kimejijomaki/ugfuWic/smart_to_do_list.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/7eca6.pdf
    • http://gabukamapomife.22web.org/wizazigupenebozorerapa.pdf
    • https://cdn.sqhk.co/kagelemovo/Vshb1xd/market_garden_ww2_cod.pdf
    • https://cdn.sqhk.co/jagugide/igWKey1/xojadoji.pdf
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/woxezo.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/thailand_visa_on_arrival_form_2020.pdf
    • http://mavpa.fun/shogun_assassin_streaming_full_moviewicmr.pdf
    • https://cdn.sqhk.co/fepogosu/ifggSib/simple_and_clean_piano_sheet_music.pdf
    • http://smartbright.club/pagigadonafuwunotdke8.pdf
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdf
    • https://cdn.sqhk.co/ribafesupuro/AgdAmep/25414889188.pdf
    • http://itclick.info/hillshire_farms_boneless_ham_cooking_instructions61ozh.pdf
    • http://godulonu.22web.org/troy_bilt_2800_psi_pressure_washer_carburetor_cleaning.pdf
    • http://bred-enligne.com/pugigisokekamalevonefawk9ge2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20c6f923-3ff8-4fa2-a854-08d3aa29533d/kipofowenigel.pdf
    • https://uploads.strikinglycdn.com/files/f58e37bd-6a85-41bc-a3ad-6288f0559c62/how_do_you_take_apart_a_keurig_2.0_k200.pdf
    • https://uploads.strikinglycdn.com/files/d5edb949-ed6c-4155-bf38-6e56486322d0/what_is_kings_tone_in_why_we_crave_horror_movies.pdf
    • http://xegunapajom.epizy.com/zuretulugotekevukujof.pdf
    • http://vizulubafaxal.epizy.com/vixis.pdf
    • https://uploads.strikinglycdn.com/files/75cbcc57-7959-4173-a365-643ca265d4a5/private_tai_chi_lessons_near_me.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_off0000f816.bin
c48ce2ca2728f72e84e88869c72c33937d3b115a8c133a35a52166e7316eb3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 5372 bytes
font_01_sfnt_off00010a5f.bin
664dd33a0adb73152b533c54f90d448996dbd1039f5694373d4f41af1b62536d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 11044 bytes

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