Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1945ad8b5ead9b6…

MALICIOUS

PDF

86.3 KB Created: 2021-03-01 11:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b6a4ba7f8e01de77a069f504a0faa8b SHA-1: 1ca1f1b80c1daa876a264fed5c570f4f0f575ffc SHA-256: a1945ad8b5ead9b6410c10a2e7df9587c78f36eb2b5d91a44865d32a9e195f94
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=la+la+land+pelicula+completa+online+latino PDF link annotation
    • http://consequences.space/vatalunewuligamuzirodaxiyuc9r.pdfIn PDF document text
    • http://disconto50.pro/89287406080vw5bd.pdfIn PDF document text
    • http://shtampshop.ru/84617707530abs1b.pdfIn PDF document text
    • http://pubgmobiie.com/jine_mera_dil_lutiya_mp3ldnsn.pdfIn PDF document text
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/1696069.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/fb4cfe2419cf.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/tabamanexirasoxak.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/bgerDhe/funny_gifs_for_men.pdfIn PDF document text
    • http://drovazvenigorod.ru/crazy_eights_card_game_cool_math_gamestyh4z.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/fcUjiDF/32918229041.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/falolari.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/jeloge.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/080908e8a32ddff.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/mujesogi/kerboodle_answers_french_foundation.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/acting_lessons_game.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 13252 bytes
SHA-256: 253e1d1e7894f065b24801de13857ce61d089cf0eb19e50e31aaff312930484b
font_01_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 4888 bytes
SHA-256: 8c0ad5d50c377a9ede39c3656492b2e4f197cdc55d71730493f34654468a348a
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 11624 bytes
SHA-256: a0b43eb7b7d8783959cae5a7487453ebe96b276ac5169fe0c0655ce1cb26fb15

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