Malicious PDF — malware analysis report

Static analysis result for SHA-256 be886534c3070c93…

MALICIOUS

PDF

75.3 KB Created: 2021-02-16 08:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b900033af7cec0b2b103cbf375980a79 SHA-1: 50b36f6f99d3ca45a722af739638572c04a37759 SHA-256: be886534c3070c932b37ddf7e6a572ad48f55926b9547a90f84bfe193e729de3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be a link farm. The document body, though heavily obfuscated, suggests a lure related to mobile gaming OS, which is likely a pretext to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=which+os+is+best+for+gaming+in+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369794/normal_6027c50bc8039.pdfIn PDF document text
    • http://newyearshop.site/math_number_flashcards_printable5wlop.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/filaxizedokefozam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_60018d9bc43eb.pdfIn PDF document text
    • http://mosdendy.store/cheluvina_chittara_songs_songsb3fjm.pdfIn PDF document text
    • http://bestplacefor.rest/frank_ocean_lens_v2_downloadvpymx.pdfIn PDF document text
    • http://rezotu.xyz/circumcenter_and_incenter_maze_answerst0cjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fd137aa4402c.pdfIn PDF document text
    • https://weromosamewose.weebly.com/uploads/1/3/4/2/134265498/xunolitolozite_dugenegopis_xavuxabifila_guzoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_601f1e0d11600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fd939b19849e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ragejufa/85023949787.pdfIn PDF document text
    • http://navasegekukuj.epizy.com/bernier_distressed_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/64178766714.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/certificates_template_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/tlv_acgih_2015.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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5448 bytes
SHA-256: f88523b2f00d932b3bf2a9f0913ec16469d42c1c57a532fe8227a7fe234b7ba5
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11228 bytes
SHA-256: 70ac921f8ac2cc95acf78e96c1b88c4517b31652e1d1b40df4988bb4b99c5f03

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