Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb360d852b073af…

MALICIOUS

PDF

76.0 KB Created: 2021-03-10 22:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f4c7c75895d2e528e94f642abcd9bd8 SHA-1: cc4019efcc8bd6a085d0ad3e5b11742283113caf SHA-256: 8cb360d852b073af2c2a968b9363429d396f3f222f57a5fe9a5368d26dc9faf6
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and keywords that could be used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=important+synonyms+and+antonyms+for+placement+pdf PDF link annotation
    • http://wedidizelajat.mypressonline.com/bag_s_groove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6027f0aa23d30.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/gonevukaxap.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/8ff89fd.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/wilawivajib.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/joguregoverudal-lagaluvoz.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/7015845.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/8643455.pdfIn PDF document text
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/wisafifoxazonok-zuboma-josovosap.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/c77f9.pdfIn PDF document text
    • http://jajifejeda.22web.org/does_costco_have_keurig_coffee_makers.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/56111004174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_600f03965b6dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ff66a7fce0e0.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/flammable_cabinet_grounding_osha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_601664e192ef9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasudef.rf.gd/strong_vocational_interest_blank_test.pdfIn PDF document text
    • http://sigamit.epizy.com/28308256117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c2231e-2f2c-435f-ba08-7964f750f025/78250972791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c816520f-b38c-46f9-967c-2dbac43ccdd2/fixedebubipemuxeru.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/58035894826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b1793d-a21d-46a9-ab1e-ee53f34b7eae/88842698872.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/zeridabubetanafujelinevij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55da1bf4-e24e-4f9f-95ea-1b5baafc7e4b/reaching_down_the_rabbit_hole_download_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5340 bytes
SHA-256: b265b8ce400bad706ed1cf0f2556bc24b219df813f1ab9846c34ce794a70bf22
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10684 bytes
SHA-256: 5948011012e5632769448d19b5032ded72124531c560d4486537bea07d05dc6b

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