Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73a6b8f552b8e5…

MALICIOUS

PDF

72.4 KB Created: 2021-03-28 13:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f47c3a140d035cee7f58c0b86d97793 SHA-1: 1dfc60fa96b7a8a4f7b78f2c9f12460ce681daf3 SHA-256: 0c73a6b8f552b8e52acdb3258a6c3a7362d2105e22c4dfa6f6d327c35b1be899
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs indicate an attempt to redirect the user to malicious websites, likely to deliver a second-stage payload or steal credentials.

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://nipisod.ru/123?utm_term=abstract+art+black+and+white+able
    • http://tonilakifak.mypressonline.com/gazasufofo.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://pop-marketplace.ru/8664560729bcqyj.pdf
    • http://kefowawud.22web.org/alpe_d_huez_historical_snow_report.pdf
    • http://viteroludobano.mypressonline.com/californication_guitar_tab.pdf
    • http://vasakuso.sportsontheweb.net/25568093248.pdf
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5ff07e1ac9d77.pdf
    • http://detonic-ro.website/996285931598jwrt.pdf
    • http://tepafuvofes.iblogger.org/16503044513.pdf
    • http://cashthe.ru/84862521544ge92e.pdf
    • http://dfds.in/fufukarevudajiwogizupirom2xv0.pdf
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134d0d75869.pdf
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5feee97c1f015.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e8c2c81a0e6a4838bd2e2c9912a6321b.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_193de667d2d14b7daff4313644e956a0.pdf?index=true
    • http://lajovaputap.myartsonline.com/powetidinewotepuduz.pdf
    • https://s3.amazonaws.com/ganubifirigevi/93240786566.pdf
    • http://bijiwamosijiw.epizy.com/dell_optiplex_760_power_supply_repair.pdf
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_80a38fcb311c4b53864e29cfbe365366.pdf?index=true
    • http://zunasolaxugi.epizy.com/the_adventures_of_augie_march_analysis.pdf
    • https://s3.amazonaws.com/vuforewebub/cv_template_nz.pdf
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_c0206aea63124e95864fd424013c5fe2.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_off0000dd8e.bin
531ed63357cd558ce6a701a47792234f5f7ff475de30a0028a5b9e1cb90291ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5312 bytes
font_01_sfnt_off0000efa0.bin
7a8620944b88bb0f957e6a602aad395f412be16c990b304933a45bfee8d529ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10288 bytes

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