Malicious PDF — malware analysis report

Static analysis result for SHA-256 225c3b51c7504a35…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 16:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d397317ec92cc52600260c8d744231cf SHA-1: 0bbfa1b7068e85e5d80d730d6a12a1e69632cd35 SHA-256: 225c3b51c7504a353017f5bfe205c48b22c8edf816a1926aed5b5856096a2856
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to drive traffic to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a content-luring attack pattern.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=academy+stars+starter+pdf
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5fe78bfea64ee.pdf
    • https://cdn.sqhk.co/ruxuvedije/VgjjaFM/65664804079.pdf
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fff623868980.pdf
    • https://cdn-cms.f-static.net/uploads/4446270/normal_603b4c3b1b619.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_602f09679511e.pdf
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc57c5dea463.pdf
    • http://wogizejelalod.iblogger.org/add_subtract_multiply_decimals_worksheet.pdf
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5ffbf4d3ea34a.pdf
    • https://cdn.sqhk.co/vudararemane/GdJhdid/kawokumufatuxaguno.pdf
    • https://cdn-cms.f-static.net/uploads/4465274/normal_60144d4037607.pdf
    • https://cdn-cms.f-static.net/uploads/4377109/normal_602f79e806de6.pdf
    • https://cdn.sqhk.co/vopuvafamiw/UDfhg68/assassin_archer_modern_day_robin_hood_game_download.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6023b8d2afa9d.pdf
    • https://cdn.sqhk.co/vusutesilo/jhghdhc/80s_music_radio_station_dallas.pdf
    • http://dezirutumevolu.iblogger.org/arbitration_act_sri_lanka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b8565b83e2ca44118cb48eab3dc61757.pdf?index=true
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_1b5fb7d84c1745378d167ae59fb8f64c.pdf?index=true
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b962c4f6af8348e9b88c4b409787a611.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_90ad8fae938547559153771abdc04140.pdf?index=true
    • http://femasusatatovet.epizy.com/tilakenufabizikirakaxo.pdf
    • https://ecbea88f-e321-487e-b3ee-b24acecca261.filesusr.com/ugd/738632_f503606993314717afc180ee8195c1ff.pdf?index=true
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_4950ea02fbf349f69b1331f7a7dd2abe.pdf?index=true
    • 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_off0000e00e.bin
4a126cedae476fe93246aa42c0eb352ad1f2eb99f5ccda2515b2aea6bef6420b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5360 bytes
font_01_sfnt_off0000f243.bin
7ce44a672ca8162ca282ee5d219aec18702b540f1874e013dafed71dae8514b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 23580 bytes

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