Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18cce44a0f0fec5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 14:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 509146af2de9740ed6d372912da7e54b SHA-1: 270db9cf258f4a674be06df72fd2a21893d14538 SHA-256: b18cce44a0f0fec5d630caee94977be8964668f04c20d9996e79ffd931cf4139
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to a literary work. The presence of numerous external links suggests an attempt to direct users to potentially malicious websites for phishing or malware distribution. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=was+it+a+dream+by+guy+de+maupassant+questions+and+answers In PDF document text
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/3206684.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/tjc66oU/dibovigigun.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/ct0krfG/74422446515.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/1RjcjcW/gobble_dash_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/jbgj1hd/kuridijetadadikixakib.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/what_is_executive_director_of_a_company.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/dEjhYie/visiting_card_background_hd.pdfIn PDF document text
    • http://majikok.mygamesonline.org/gademikamosonep.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/50421715988.pdfIn PDF document text
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/domepotuva-gawide.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/c5tUUIm/laxixesejinopeniw.pdfIn PDF document text
    • https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/8048927.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/q0jhggs/87087421724.pdfIn PDF document text
    • http://supernefritroller.xyz/dawevasrkap.pdfIn PDF document text
    • https://cdn.sqhk.co/lixabanitav/cgfyagh/27607781659.pdfIn PDF document text
    • http://re-prime.ru/ferrari_458_spider_racing_wheel_pc0v0im.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nutanigonu/57190850375.pdfIn PDF document text
    • http://wugerubuvugox.myartsonline.com/seconds_bryan_lee_omalley.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/boveduposuxuxoleneb.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/blades_of_brim_apk_mod_hack.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5604 bytes
SHA-256: 5d8e39ea679f10f34ada65ad9b65eddbae72f75eef9e4327baf59728789a6f60
font_02_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 11248 bytes
SHA-256: 3d93e7eb69d085a5f3432a488d93af84325c45b1a7309bf0a7dc4c5edfaf7558
font_03_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3