Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f08a8734f7b26d…

MALICIOUS

PDF

99.7 KB Created: 2021-04-25 20:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0f2fa39dffd01f40d8b9d6ddad87cd7f SHA-1: 2a5a1d67afce8b0caaf5daaa5688307f626f0c9d SHA-256: 39f08a8734f7b26dccce3f281502b7554a822c977aad69981883657272755536
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://golowaki.ru/strik?utm_term=what+is+an+aviation+boatswain+mate PDF link annotation
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/ronutare-katotorilub-regijonasurevob.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/9211609.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/xarobutufeti.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/avengers_infinity_war_full_script.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/advantages_of_authentic_assessment.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/down_and_out_in_paris_and_london_audiobook.pdfIn PDF document text
    • http://karnaval.host/691027807293emwu.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/wupukajaziwewowamagesuxad.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/9103778026.pdfIn PDF document text
    • http://carishr.com/67719129599tdlc6.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/5571522721.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/9ae18b5cd38.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/kaxefi.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/jamefogagefekowov.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/how_to_hook_up_a_portable_dishwasher_to_the_sink.pdfIn PDF document text
    • http://rivugijunamusi.mygamesonline.org/kasat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/3939876471.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_3f76385fb0b74c2599ec3f2a592324e4.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_d975bbbea6e141da9f5ccf706830e40b.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/kulijuvesawadunume.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 5100 bytes
SHA-256: 12d1871326110190a50ab9bc816def65e95179f60ab1e508c54aa83733251f67
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 11008 bytes
SHA-256: 4cea0747faca4d58bc2a71b7b2770e3662d15406d1971a4ddedb55c685994c33
font_03_sfnt_off00014a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 18444 bytes
SHA-256: 486771d0193832a93560ed246ab9a2174377f95eae731bb1e57c246029f83d73