Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8631229fc51e68…

MALICIOUS

PDF

74.1 KB Created: 2021-05-21 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 36dc97d280c951ffd0f5f9575fb1790f SHA-1: 234262d6a06757df6eecda7752be56d993e600de SHA-256: fe8631229fc51e68b5e070b30485aa16b180d1ecc2547e75d3e6d9a25d573bee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/strik?utm_term=phoenix+securecore+tiano+setup+password PDF link annotation
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/1041582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_60491b995c52b.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/66c92f7f98b51.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/wegisuzanebe.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/9078367.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/jovegofoxejaxo.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/5280876.pdfIn PDF document text
    • https://rosiruwolokixa.weebly.com/uploads/1/3/4/7/134765588/mumuvag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_603c25fe4260c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5ff9dd808ef4e.pdfIn PDF document text
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/zumodogerubajika.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/gojetumefig_narevex_karufoku_guseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_6016432cf1c1b.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/geralogej_wanazaguxam_zejupijunuja.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/baxudejubebuz-fisaroja-pupepup-panumegase.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/4de79bb600d101.pdfIn PDF document text
    • https://negoladudovas.weebly.com/uploads/1/3/4/4/134456372/lokegawojirapokilone.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/lixopototagidutijaf.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/najipavez/bear_cruzer_g2_rth_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/free_nursery_rhymes_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/evenflo_chase_lx_harnessed_booster_car_seat_jubilee.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/how_to_remove_dark_pimple_spots.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/xosibefizukerasozifaza.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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 5172 bytes
SHA-256: bcda1a43fae5360f5f1497195c8c98f4a8fee1c5797b763eaf418cffef93e690
font_01_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 10236 bytes
SHA-256: 4d70709a8499742b54656f6368cd67f01876074c5844ef27c4d3f2cb70d3191e
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378