Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f0f2760f573aa…

MALICIOUS

PDF

111.9 KB Created: 2020-11-20 11:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 691d335bc46afd1169953cf39c146e98 SHA-1: 18573b4493f6a3fbbd9b618f4c0e6c5d45e13eb6 SHA-256: 8b3f0f2760f573aa27c1ff1fa7800be4dcea71ef49d2dae9a2f1e70b7540b87d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm. The document contains numerous embedded URLs, many pointing to disposable hosting and potentially malicious redirectors, suggesting an attempt to lure users to harmful sites. The presence of a link to 'traffmen.ru' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=probabilidad+y+estadistica+walpole+4 In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/vasan.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/zeduwaxis_galazomilukema.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/2038155.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/lumegitapoz.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/7844104.pdfIn PDF document text
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/4bb75d.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/rezatitanik.pdfIn PDF document text
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/jexubafajan_nedemigelirul_xaripezu_vakiza.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1fa2e5b5-0750-4415-846b-660bd4a7bd5b/mighty_morphin_power_rangers_nes_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0717dc71-d3b8-471a-9641-ef125d829647/canelo_vs_jacobs_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5445834-4ccf-4486-a304-af84ac9c4bdc/fallout_new_california_fix_the_old_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81950875-b89b-4bfa-9956-75359961f252/96275267923.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 4552 bytes
SHA-256: b71fc2c8a579ced1848ab04a0f8d5479a233c9bdf507d377dc5f83376326f3b7
font_01_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 5228 bytes
SHA-256: b08b305c4d07b1e4fb7070495fed437a01a1b3a9b12a278cd108dbd3ae5f35ef
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 5172 bytes
SHA-256: 756ea03a699e7db84f7b054132e26b93d8af6145400bcd79d6d4e8fd33905552
font_03_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 3540 bytes
SHA-256: 2eb9085bc4f514024c51f5d9a14f788b3d1315bb153bc9e8682c08902c1ee8c3
font_04_sfnt_off00015122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15122 14252 bytes
SHA-256: 9c133b2d3210c9fba1841a10a15a497f4c861840eb27955e0c907bcb33b205ba
font_05_sfnt_off00017e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4C 3908 bytes
SHA-256: 1f4830bc58ddbb60976b431acb3dc5671ab3302231f1e72b7edd8ac2ddbb7437
font_06_sfnt_off00018c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2E 16064 bytes
SHA-256: b8373ff7a307177187b970a34f77430617b0c2d6b733603715ec3ddc006202dc
font_07_sfnt_off0001a0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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