Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b5d82f0ff87665…

MALICIOUS

PDF

123.5 KB Created: 2021-03-25 02:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cab41ef1a894d04dc8e73a12923a0333 SHA-1: d439978f0bd726dbd30d81a24a02b506db8d0ca4 SHA-256: b1b5d82f0ff8766547aeb99b1a7a8ac8ad206faf40a3a9675839c9eb83040bcd
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'darwin s natural selection' and is associated with external URLs that are likely part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=what+are+the+four+principles+of+darwin%25E2%2580%2599s+natural+selection PDF link annotation
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://omoikiri.info/pajama_friends_ep_2_eng_subbiu3u.pdfIn PDF document text
    • http://legendbilisim.com/xasuxaxuvugemrz5wd.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jismjbZ/reposter_repost_for_instagram_download.pdfIn PDF document text
    • http://pedron.fun/ff_live_streaming_hari_ini_tv_onegw4bk.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/lijedibefufudezodezojo.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/arabesque_n1_debussy.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/Mjjggjd/6481775311.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/uighjjh/ternary_ionic_compounds_worksheet_answer_key.pdfIn PDF document text
    • http://salopkisa.website/werufapeludepetisigewow5ue0h.pdfIn PDF document text
    • http://yourbigdick.space/medogewajivadevopaskimu.pdfIn PDF document text
    • http://winnerslm.space/bonner_and_partners_the_near_future_reportwbqwu.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/bitwise_operators_in_python.pdfIn PDF document text
    • http://getdouche.xyz/rifurijidiguleoarf.pdfIn PDF document text
    • http://moscow-siberian-force.online/pamiwinagisokokojonibemu5bv2.pdfIn PDF document text
    • http://bufo.online/how_to_fix_dsi_faultpdg5v.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/lUquIrA/89777991806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadbbc4f-2875-4719-a812-9d923c01efb3/how_do_you_light_up_a_gas_fireplace.pdfIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_183284d8f26947449bed8ed0ae180941.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_d682b56abc9d44f9a08034df0e2e7a1e.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_187510d3c4ed4e608915c511444a4466.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa90952-8745-431f-b009-107d17bb6b7f/46139294587.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_60ab0fe02b4443e4afb8a8a260ea5f5e.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_off0001a24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24A 5400 bytes
SHA-256: 942c617229a7e497c46f902eb961190d174bd42dc9fa01e73ed326a42616f08f
font_01_sfnt_off0001b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C3 11704 bytes
SHA-256: 92508f8525e7836b035416d2d10ee1dc791328ac1ea0bb515627b2b4e0351b2b