Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12f54ba2994de3f…

MALICIOUS

PDF

69.0 KB Created: 2021-05-25 16:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221d8998118287672a9e4dee74cf7685 SHA-1: 6264fc5248dba2fdee2cc6bdee192c1ecc9ff4f0 SHA-256: b12f54ba2994de3fe477b511e30ade4e1e8c140be716b8b45ab5b17139f2cd92
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous external links, suggesting a link farm or phishing attempt, with one URL specifically mentioning 'medal of honor heroes free roms' as a lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=medal+of+honor+heroes+free+roms
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5ffff08517d0b.pdf
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5fe4beb6cb36e.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_606ad1929c271.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd3cbb5b2fab.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/xosodokiwitiwoj.pdf
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/gurarojibuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_60636b854ef19.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_606e1ea58266d.pdf
    • https://cdn-cms.f-static.net/uploads/4416938/normal_6069f9e692986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8691ff06-7faf-4e2a-ab83-103ecaf04ba9/jawefefidukozit.pdf
    • https://uploads.strikinglycdn.com/files/ed2a5c8b-dd0b-4e23-aa9d-f4833ed971f0/vajujun.pdf
    • https://uploads.strikinglycdn.com/files/18de9484-a341-4c81-86e3-2ff5f6eccf63/tipos_de_organizadores_graficos_y_esquemas.pdf
    • https://uploads.strikinglycdn.com/files/20b461e6-74fa-4eb2-9a51-a8a604ba7526/how_do_you_use_everstart_smart_battery_charger.pdf
    • https://uploads.strikinglycdn.com/files/9facf887-33f1-4aa2-8216-bf393ac26373/counting_stars_piano_free.pdf
    • https://uploads.strikinglycdn.com/files/543e2d67-6707-422b-b16b-c2fe5e9848ec/amar_chitra_katha_stories_to_read_online_in_english.pdf
    • https://uploads.strikinglycdn.com/files/e4df7337-cc56-4009-a3e7-3ebfe3f2d477/how_to_write_a_scientific_summary_paper.pdf
    • https://uploads.strikinglycdn.com/files/24f1edd8-59ed-4cf2-a3e8-aadb4c8c87e4/82499140713.pdf
    • https://uploads.strikinglycdn.com/files/97398cfa-61b6-4b97-80e6-1e863fd2478a/51857764318.pdf
    • https://uploads.strikinglycdn.com/files/bd80aa73-6c9b-4047-8561-b51e67383b16/2882068882.pdf
    • https://uploads.strikinglycdn.com/files/c9b49bda-270d-431f-bbdc-10186692ab01/samawavowinabololuxifimik.pdf
    • https://uploads.strikinglycdn.com/files/7dcbb0ec-d74d-4f0b-b325-9f31dc2f190e/how_to_fix_samsung_galaxy_tab_2_7.0_wont_turn_on.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_off0000d11d.bin
70210a778d922cbf89525047fcb601a73a5210cfd603df2e452fa23645c2a08d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 5152 bytes
font_01_sfnt_off0000e284.bin
3f2f36f899307c1c281e18e04db503a054ecdb775db586bddacd9d0fe76176da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10476 bytes