Malicious PDF — malware analysis report

Static analysis result for SHA-256 999ded481c6d3f37…

MALICIOUS

PDF

72.3 KB Created: 2021-01-14 07:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 935b20c6ad674459c88278c90846b701 SHA-1: d095c421cfd191ce5b4b8ef93d0e8b0d6a6ec4fa SHA-256: 999ded481c6d3f374d935816eb38bfdd259142c166fddcc8b64cf4c98c0f14f0
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or known redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that these links are intended to lead users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=roasted+broccoli+and+cauliflower+with+cheese In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f98b120abe37.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/DIhaWhi/free_football_streaming_apps_for_android.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/mazogesunu.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/warriors_game_tonight_channel_uverse.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/SJFqGw6/digiromania_servicii_clienti.pdfIn PDF document text
    • https://site-1197316.mozfiles.com/files/1197316/ben_10_heroes_united_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5fcee0d8dc745.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/pamareja-bununejevi-gojegegor-zejuzakixak.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/tunupofoxozax.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/7592372.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/pisuboj-luxoj-vilanozadav-letuzimowed.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/sojuravewi/39205240247.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/caryl_churchill_a_number.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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 5228 bytes
SHA-256: 40e4b47491ec310e7e4e41bdfee91b77ba0c5b08bc623990eb485bcb1251752e
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 11120 bytes
SHA-256: cc4b5eea488eb901c190a4893f81a8a1ce5d51b6b2cbcc77b12dce1491799684
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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