Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc66598ef5e7ed88…

MALICIOUS

PDF

74.2 KB Created: 2021-03-31 02:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c7e816cee37c6d0d321065859f3e5a76 SHA-1: 25055ccca175d8a2b0e7eb827edbe232efe169d1 SHA-256: cc66598ef5e7ed888df71d5eab2ce39e0c584779d9559eaf9963828c543a9135
244 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or scam campaign, likely delivered as a spearphishing attachment. No scripts were extracted, but the heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=evinrude+e-tec+150+hp+price In PDF document text
    • http://jubigale.scienceontheweb.net/20154836195.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/why_does_my_lg_tv_screen_keep_flashing.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/lefarumigixime-xasukavi-pukafir.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/nowanuzonafululo.pdfIn PDF document text
    • https://saxijafuduzota.weebly.com/uploads/1/3/4/6/134692269/daxolamunu-nemovikagavob-bagadefowuver-leniwipebiver.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/wuvetin-xuvadoxidegefuf.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/foxufaz.pdfIn PDF document text
    • https://gorumuzupiv.weebly.com/uploads/1/3/4/5/134510920/ced5036ba.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/xakipatafesu.pdfIn PDF document text
    • https://wawumojobov.weebly.com/uploads/1/3/5/3/135323155/jazotajuwapifo_mefagotego_tufadewar_sataveroxurid.pdfIn PDF document text
    • https://migokenumepo.weebly.com/uploads/1/3/1/4/131454620/dadudalev_judob_dovodigu.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/ed90e0264c4458.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/jukajifimifiwo.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/lavizibitupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d18d67e2bc95403ba4e9d8aaf09ef329.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_73e368be56bd4775b4b09d2a4ce84ea8.pdf?index=trueIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_dd17f37006c4419fa6da2261e0ba7ba5.pdf?index=trueIn PDF document text
    • http://pikawin.rf.gd/yard_machine_snow_blower_24.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/96368728392.pdfIn PDF document text
    • http://zudejemil.epizy.com/kojijexorijaborizowitez.pdfIn PDF document text
    • http://regujag.rf.gd/urbanismo_sostenible.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_b866041f5400486b8647455a6c043bd8.pdf?index=trueIn PDF document text
    • http://javulivaxetotes.rf.gd/the_riveras_family_drama.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_09f509ae7f4c46aeaabed4f5d72588ca.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 5108 bytes
SHA-256: 09ee4fff69f9f24275b3573f474a31e02c0769d4d89ae38de018c6d291ad2db1
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 11288 bytes
SHA-256: f5ba2978b37de233bf6395b61cd7bc75f1133f79bab3fd521ebeee667eb41492

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