Malicious PDF — malware analysis report

Static analysis result for SHA-256 370fb391e23a2ce3…

MALICIOUS

PDF

86.4 KB Created: 2021-05-08 10:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a284fac99860152409981219dc7c854f SHA-1: 50e3ea2b8ddb3b42ab6a26e83cee12b7137e7709 SHA-256: 370fb391e23a2ce39aad3f8d0f5d0e4f8e054566ab207d1f0dcc6e567debc0e5
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those hosted on domains like sqhk.co and cdn.sqhk.co, suggests a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=imr+powder+700x+load+data
    • https://cdn.sqhk.co/resilano/gjgiguz/happy_glass_near_me.pdf
    • https://cdn.sqhk.co/viwitukaz/0VkXgc0/nemuviboponovabi.pdf
    • https://cdn-cms.f-static.net/uploads/4422377/normal_603b81440ea61.pdf
    • https://cdn.sqhk.co/jimavidozeze/ifQ3ctY/vosojokajomusolosaliti.pdf
    • https://cdn.sqhk.co/rewagujil/ibhfgjo/dinosaur_zoo_codes.pdf
    • https://cdn.sqhk.co/kolusugego/gic9ihk/life_coach_programs_near_me.pdf
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fe413b5da154.pdf
    • http://avit0.pro/vivitar_outdoor_rock_speaker_reviewslf1ne.pdf
    • http://raifaisentapp.online/coliform_chu_nhit_l_g2wez0.pdf
    • https://cdn.sqhk.co/pigevikuwi/Skc6je4/55173853070.pdf
    • https://cdn.sqhk.co/nezerozara/ggjjhbO/simpsons_tapped_out_hack_iosgods.pdf
    • https://cdn.sqhk.co/depifozopupe/edcjaib/48668261623.pdf
    • https://cdn-cms.f-static.net/uploads/4402721/normal_603a83331a3aa.pdf
    • http://spain50off.info/perfil_ginecologico_14w9ha.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6066f18285455.pdf
    • http://sodahq.club/5852564254cvfx5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f184e04-e5c3-4160-9279-e360ece3560e/el_nombre_del_viento_saga_completa.pdf
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_086b22c6394541e6bc60e28593337606.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_e82884df83eb4e678a38933c952527a3.pdf?index=true
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_0c4fede8e607479ebe77445a542629d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a563d25c-3a2e-460c-9820-ccdf1c6941c0/que_es_una_propuesta_didactica_en_infantil.pdf
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_1549e802dd13435ba5e979e16538d455.pdf?index=true
    • https://uploads.strikinglycdn.com/files/237d8eea-234c-445a-938d-bd4ddd902bf8/scary_stories_to_tell_in_the_dark_movie_parents_guide.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_off0001122c.bin
a0a1e25094275f3468e24fe17c936ae5bcfb4cf24e0150e0e05c2d32e36ebbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 5248 bytes
font_01_sfnt_off00012409.bin
6d6cb85d6ba920377d73b6d40d8ec7039961de6a86bb8330ebd0d74f08962a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 11616 bytes

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