Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c567149d37fa3e0…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 10:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 277c76b26cbc0c056152f5bdfbca44ff SHA-1: 751bb1437685570800690a7f68fc45e209725cc8 SHA-256: 1c567149d37fa3e0a047b10ebc8071ad6aafed7496a90bf63c8bfcbf7a3ea24b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is zajinet.ru, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://zajinet.ru/award?keyword=central+telefonica+panasonic+kx+tes824+pdf PDF link annotation
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/mupevefojut.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/4916014.pdfIn PDF document text
    • https://kusagurapatavo.weebly.com/uploads/1/3/1/8/131871515/639742.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/jonefopifix-sozivajazunov-litedunewabunog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_600d190f142f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_60300d3a93558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_6035c216e1d38.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/4834503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fe6503105f00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2157aa03-8b09-4ffb-95a4-0095f94bbef0/how_do_you_write_four_hundred_thousandths_in_decimal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd22976a-2280-4242-88a6-8e23aeca79d5/how_to_say_a_prayer_for_someone_dying.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_1ceac7c669ff4142b2fb44674c4b016e.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_574f2b3f2e0247ecb233cc46ffe9b20a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/848b0fb7-ba52-4558-973f-bffb7c87a66f/texas_instruments_30x_ii_solar_taschenrechner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ebe3b0-c05f-4218-b118-5e17c820be9f/mary_poppins_supercalifragilisticexpialidocious_lyrics.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_3957df9dd4aa4ab7978e91a64116bdd1.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_15b7f4fb3aa4454e8c5e81d75b50ec2e.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_6be797a6531842c8a74e74a5dd093d24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e201c4b-b3ed-4f24-b8ce-1c447a175f60/9448760960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d7be2f-2bff-4596-841c-2b5d50d85949/what_do_birthday_wishes_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a82bd8-54f7-4c4d-8321-f2c396672c9b/confessions_of_a_shopaholic_reading_order.pdfIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_f8d342a03f5e4a70b5def5beff286025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2ab5f6-18f2-4e1b-87c5-f559f481dcc6/60490669298.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5600 bytes
SHA-256: a5f60991eb15a0078f7565d066159fdd89b5ef6389cd8fb3b9855052b11304fa
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 11288 bytes
SHA-256: fbc9a67680e953c379d9aa08bd840fcc9360ec18fd89ec39f8864bb03d73b2d7

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