Malicious PDF — malware analysis report

Static analysis result for SHA-256 75119698977aca2d…

MALICIOUS

PDF

73.6 KB Created: 2021-05-02 00:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ef29cb9fd9ec98c33a434e6137020f SHA-1: 96dfff411bb8ee9b28cd236c0d2bd31225a78229 SHA-256: 75119698977aca2d001e9f85494f11e5efb14d0b675f27fe589ad53e4ac6534a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, with a critical heuristic identifying a link farm. One of the primary external URIs points to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it's likely a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+setup+zebra+zp+505
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/c57b163.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/2368313.pdf
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/mujuponuzumi-begur-lakanopade.pdf
    • https://parikijofema.weebly.com/uploads/1/3/1/3/131383717/fudabaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/90c8e34a-f439-4ffe-9476-f73ff852f6db/32879236118.pdf
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_f95c59eae56d4ae38940d3d890654e34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a281fc18-199f-407d-b2bf-5e0504915fae/what_helps_stop_smoking.pdf
    • https://s3.amazonaws.com/bomupi/les_adjuvant_du_beton.pdf
    • https://s3.amazonaws.com/voxazedisula/56631252744.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/71947861154.pdf
    • https://s3.amazonaws.com/jenisozazewubo/what_is_a_goodwill_in_business.pdf
    • https://uploads.strikinglycdn.com/files/79e7a2a4-d7cc-4935-a9a5-7b13c7dd1489/71467382152.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/how_to_clean_kitchenaid_coffee_maker_kcm111ob.pdf
    • https://s3.amazonaws.com/pujirageg/aambala_video_song_hd_1080p_free.pdf
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_49fd13ed14034a578d9bb9c8dd3a1e48.pdf?index=true
    • https://s3.amazonaws.com/mukutud/house_rent_receipt_format_for_income_tax_word.pdf
    • https://uploads.strikinglycdn.com/files/9c452cfb-79b1-4212-8d30-e39954f95fee/phonemic_awareness_worksheets_for_kindergarten.pdf
    • https://s3.amazonaws.com/bisapovepizaj/charles_schwab_ira_distribution_election_form.pdf
    • https://s3.amazonaws.com/jifedefujodu/zibimabexo.pdf
    • https://s3.amazonaws.com/sugosubexez/fikutesufugosewejekum.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_off0000e32e.bin
8ab917656c5496869c47286d43315bb5a0097f73c32c7f3913aebfd83d746c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 5288 bytes
font_01_sfnt_off0000f54d.bin
fa4e06b2595f69ffc20fc1c67c9e984f3cb66c7d9564f68c22ba0c2aa0bc3d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10592 bytes

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