Malicious PDF — malware analysis report

Static analysis result for SHA-256 6896cd5bac3745aa…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aa7cbdc7b2b4d9ce85fce6d516bf35a SHA-1: 7ae37db9a022faf633ff253f94f067430c004700 SHA-256: 6896cd5bac3745aad16e5c3b983071aee26520ff4d68504f336a0b3815d0bc88
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded content, though obfuscated, appears to be part of a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=tea+party+invitation+template+word
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/5e87623.pdf
    • http://vurejowug.mypressonline.com/sitexodomekididuwin.pdf
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/bujapekomu.pdf
    • http://fakexexu.sportsontheweb.net/water_purification_plant_business_plan.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/jazilipexujenilu.pdf
    • https://sexaluweve.weebly.com/uploads/1/3/4/8/134854061/ronowopumuw.pdf
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/6936777.pdf
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/7776986.pdf
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/9862347.pdf
    • http://nidewopovuwubo.mypressonline.com/55867447079.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/rizelawof.pdf
    • https://uploads.strikinglycdn.com/files/5ed1aa9e-3681-4b28-998a-2816b5ca3e63/how_big_do_standard_dachshunds_get.pdf
    • https://s3.amazonaws.com/wewiro/dragon_ball_manga_chapters_wiki.pdf
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_687c4bc772484abcb6c63b0f1c35ce3c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d817d4f-b402-41a4-9bad-e49840e62954/15801226574.pdf
    • https://s3.amazonaws.com/kavalukato/libro_de_los_sueos_numeros_quiniela.pdf
    • https://s3.amazonaws.com/fadadedezeker/chamberlain_garage_door_opener_remote_not_working_in_cold_weather.pdf
    • http://bajupigirosinaf.atwebpages.com/antonyms_and_synonyms_list_with_telugu_meaning_free_download.pdf
    • https://uploads.strikinglycdn.com/files/0596ac21-79d3-43e2-8d09-77c66ed44988/how_to_replace_toyota_corolla_battery_cables.pdf
    • http://gixejemazob.myartsonline.com/sabovaroxeb.pdf
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_1601bee264304fceae421d582bb24a55.pdf?index=true
    • 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_off0000f90d.bin
b824197c5d447cdec61438642eb8d9e5d3f9018e970c212381663f78ae8f95d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 5128 bytes
font_01_sfnt_off00010a86.bin
7cec0b5a5ab487cff050718920d0bc3514c13fd12766a58dad0bb74fc9998b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 11044 bytes

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