Malicious PDF — malware analysis report

Static analysis result for SHA-256 7901fe4787f7eeef…

MALICIOUS

PDF

67.6 KB Created: 2021-03-12 07:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 56ffebfc1b0e9237dfb3fb6603c08e49 SHA-1: fc7713b9344b6fcc46caa8b3e84c8f9d9d5cac93 SHA-256: 7901fe4787f7eeefe1e612a366bdc5c6d545a579f4294d62e4bb6915c1b3e5f8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious content, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=netgear+gs108pev3+default+password PDF link annotation
    • https://sumokexopusoval.weebly.com/uploads/1/3/1/3/131378975/fb72b27009831e.pdfIn PDF document text
    • http://saxoxiwu.iblogger.org/58944396954.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_do_you_unclog_a_hoover_windtunnel_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/fdjijhR/mega_mall_story_combos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_6006146e9b4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_602818f087509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_602aa61c3dce1.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jcibid7/pick_me_up_costume_party_city.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/rheKLje/70292138431.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/9YIhfkP/fbar_report_highest_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/rgfgfcu/nihachu_fanart_l_manberg.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/pinuloximox-zevad.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/how_fast_can_the_body_heal_itself.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/5682825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_600e4432b5bf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_6003b7cfc25dc.pdfIn PDF document text
    • https://buvesedivuros.weebly.com/uploads/1/3/5/3/135398108/4614364.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/c4c649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutekumini.epizy.com/guide_to_writing_explainer_video_script.pdfIn PDF document text
    • http://mizotafadoroze.rf.gd/media_player_for_windows_10_n.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/tu_eres_digno_de_gloria_danilo_montero_letra.pdfIn PDF document text
    • http://wubazinosimisod.rf.gd/xebuputigawugeg.pdfIn PDF document text
    • http://xuvuxipaga.epizy.com/8978935552.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 5884 bytes
SHA-256: 76f538b9734a00c913531157e2cb07e605330b174366d585319b7b25b76b93d0
font_01_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 10456 bytes
SHA-256: d682e49b1f2328daac8cd02c145df3283b615d95d7ebe43336dffad74a65faac

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