Malicious PDF — malware analysis report

Static analysis result for SHA-256 a990548451dd97ed…

MALICIOUS

PDF

71.3 KB Created: 2021-04-01 08:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfe7d2ac6fdf432a75288d6d60079e06 SHA-1: 1359e69cdfca684447fa2c647aaf31143f3d34fc SHA-256: a990548451dd97edf224a6f5a3ba65932ea6f6b6ec18a27d10fc43050516ba9f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO scam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body, though obfuscated, contains text related to Android development examples, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=custom+recyclerview+android+kotlin+example
    • http://rumepado.mypressonline.com/8659002827.pdf
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/2403969.pdf
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/geguvamed-kugewaxa.pdf
    • https://wubiwadodeta.weebly.com/uploads/1/3/4/5/134577579/velenodij_sarorobojip_pamojafipudeb_lazusebobo.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/2221291.pdf
    • https://kijapadawoli.weebly.com/uploads/1/3/4/9/134900431/a7ee2ea8f4d1.pdf
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/giruzuruvetotot.pdf
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/busivi.pdf
    • https://fuzobiwi.weebly.com/uploads/1/3/4/7/134717163/8afe6ca4eaa661.pdf
    • http://pazolozul.mypressonline.com/28933088790.pdf
    • http://tivuximuliku.mygamesonline.org/avon_products_catalogue.pdf
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/6964072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b207348-6778-4536-85b7-51d86cf39394/12692482231.pdf
    • https://s3.amazonaws.com/fidefofudi/accounting_definition_by_different_authors.pdf
    • https://s3.amazonaws.com/tasufagijaremo/52828343600.pdf
    • https://uploads.strikinglycdn.com/files/5b47c979-065f-4bd6-af5d-7018e32fe467/vicks_cool_moisture_humidifier_instructions.pdf
    • http://vamavaremimot.atwebpages.com/mapa_carreteras_castilla_y_leon.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_off0000d0e0.bin
0610b14369cd8feb1f79708f6d3939dda68156deed852a28811284adced8d2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 5512 bytes
font_01_sfnt_off0000e3a1.bin
061782372f4b7d4c61affd73a2c9e39f21387350f776fdd78597d95e84499cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 17120 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.