Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae54bcaa4843c6…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 13:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 160b72f5d263dd688bfff71847d47af7 SHA-1: ef4c155347528436213b8e126651a5e0a97518c7 SHA-256: 38ae54bcaa4843c6ea598fb114b3486c75ef51444f9dd8523b40eb0636ca9a0f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=club+cart+parts+australia PDF link annotation
    • http://giwitijudaleka.mygamesonline.org/how_to_setup_pioneer_touch_screen_radio_bluetooth.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/baby_bjorn_travel_crib_vs_pack_n_play.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/23102550093.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/hhphjeO/59126842843.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/newuban.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/iiDigjd/camera_magic_lantern.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd9b909a8993.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/how_to_apply_self_stick_vinyl_wall_base.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_602ec478163dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_600c1fdb35b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_6023f1ecb311e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fe631eb79c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6045e8bc539e4.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/dewavodexos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5fdeb3345e702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_4974683cfef348c286958fcdf2b71b5e.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_840d4b44e897464393315fe9c0e4beb1.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_b0465cab01084d588fe299585a50d727.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 4972 bytes
SHA-256: 5034f8b037ab039acbeda38a75d86a1af1e584a2b5194ce0252a98d0ae7c37c5
font_02_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 11292 bytes
SHA-256: 30c15615377722c0b59999194256f354b0da86521165e54934e2eebb876e1054
font_03_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1