Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d9c13a7dcaf24c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 20:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d2029ea1817043ebb84c425ed59eec SHA-1: d5c88bdab2cae42c485b2ed21cb880e55882f160 SHA-256: f6d9c13a7dcaf24cfd21453cad83327b0d322208cee5309391539c5eb21f6e3b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominently featuring 'hack free fire diamonds', suggesting a lure for malicious activity. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristic firings indicate an attempt to redirect users to potentially harmful sites.

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://maypoin.ru/wix?keyword=hack+free+fire+diamonds
    • http://m-ryanaf.site/dutakwvcu3.pdf
    • http://tipografiyav.moscow/godonigi3wvcc.pdf
    • https://cdn.sqhk.co/tajelezoja/kkcbvFA/21183633103.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/bafazalafoweluji.pdf
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/47149796d0d.pdf
    • http://about-central.com/en_rasavin_manasile_songs_free_download3w05i.pdf
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/sopom.pdf
    • https://cdn.sqhk.co/lajoroteb/ssRNhfK/monavejiponodoxiledup.pdf
    • http://amorexpo.com/vopanefomidumawu5imym.pdf
    • http://igcopyrightverify.com/nail_it_to_the_cross23n34.pdf
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/mivesinaf.pdf
    • https://nirafagasebop.weebly.com/uploads/1/3/4/5/134588809/fezuki-wusomonexa-gogelojo-kasuwarosivezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0aee402a-6991-4401-becc-f96e56f487f6/rope_knots_for_dog_toys.pdf
    • https://s3.amazonaws.com/xajowu/zujer.pdf
    • https://s3.amazonaws.com/tiniruru/kisibifozoluseduk.pdf
    • https://uploads.strikinglycdn.com/files/1244a3f8-03c3-4d9f-8a3f-a0b588edeecc/100_gr_harina_cuantas_tazas_son.pdf
    • https://uploads.strikinglycdn.com/files/8df3ed1a-0270-4e8e-923e-4323355fe214/zonetagolekogakuku.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_e9907ee58a6440b08cb1b0dca7b3556f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d212133-c300-4395-ae2a-f62c64768290/tiwolup.pdf
    • https://s3.amazonaws.com/nonipesikiri/proform_cardio_hiit_trainer_7_display.pdf
    • https://uploads.strikinglycdn.com/files/30cb72f7-0a55-4087-b46e-3a737fe4cb64/microsoft_project_manager_for_mac_free_download.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_off0000e1ad.bin
89847793cff72394ced200d45375fba6a85d582f39a4ce60fdcbd57011ffbd1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 5160 bytes
font_01_sfnt_off0000f328.bin
5bd15218532e4ff48ffa8cbe46dc6a4291fca04d6d8f33be65d4eaea245dd628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10932 bytes

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