Malicious PDF — malware analysis report

Static analysis result for SHA-256 5203d0247113e278…

MALICIOUS

PDF

70.7 KB Created: 2020-11-17 01:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9191379c379d23942a2c3a8e961d7e69 SHA-1: e704fcd0da0982be76a2310f40abd49b6b00a1ae SHA-256: 5203d0247113e278b2803afb51ac66db27858a1e6a0e1b38f0ac2a194cbc8717
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://traffking.ru/123?utm_term=diablos+tyrannis+2+augment
    • https://tuzuvujejoru.weebly.com/uploads/1/3/4/4/134442534/fixidutupemegi_nosogaxigu.pdf
    • https://towajusuw.weebly.com/uploads/1/3/4/5/134521237/rovuvurodiwifi.pdf
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/badulaxikotaf.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5faae074ef858.pdf
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/pupalojekiliwes.pdf
    • https://cdn-cms.f-static.net/uploads/4480584/normal_5fa7d94418ed1.pdf
    • https://gifalixes.weebly.com/uploads/1/3/4/5/134593917/8402135.pdf
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdf
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5fa40cc8ef86e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da00d7ff-038c-4224-9531-46430fd450fa/17795258117.pdf
    • https://uploads.strikinglycdn.com/files/4d5b6880-7fb7-4520-9f74-a0fb020bc563/ps_102_elmhurst_ny.pdf
    • https://uploads.strikinglycdn.com/files/c7c2c239-f9a0-4f04-9034-12dbeca67b70/giwojenukuxilelo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b929.bin
c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB929 2888 bytes
font_01_sfnt_off0000c369.bin
839144532fdb2a1fa163a86585e1ef99efbeb2b45b2ec7d417fc40363a8a57f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 5376 bytes
font_02_sfnt_off0000d5ac.bin
36285065d7721f53f1446a0b66a727ace74ba216e09f9cac8bfc9bc10075496e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 10268 bytes
font_03_sfnt_off0000f8e2.bin
8f676b3be356e2086f34f7c81dd3575184be90372cbe0b4aaba7ba30be3377d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16060 bytes

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