Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd7b8b53c6f957…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 01:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5b7f61502f8f1671300e69f65bea29ba SHA-1: 572f9f98ba078b6c08dcaec342382c6a06c6e302 SHA-256: afcd7b8b53c6f957340fb28bd6b38fabaeb9d07948073f615bf7155ad6e5bad6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URL 'https://jacksth.ru/award?keyword=convert+cdr+to+pdf+download' and numerous other PDF links indicate an attempt to drive traffic to potentially malicious or phishing sites. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=convert+cdr+to+pdf+download PDF link annotation
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/5eae043b290963.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/buxuma.pdfIn PDF document text
    • http://it50life.pro/eso_jewelcrafting_leveling_guide72ndn.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/62efe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_603789d4e2b5a.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/kaveguvefa.pdfIn PDF document text
    • http://susobokilodos.iblogger.org/63064392696.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/295120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_6027aa0084aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7d9ca308f2.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/xapopepaniveve_bejiwodulu.pdfIn PDF document text
    • https://ginamepi.weebly.com/uploads/1/3/6/0/136024017/11fb90818a.pdfIn PDF document text
    • http://s-tochka.ru/experimental_probability_worksheet_7th_gradedpkxc.pdfIn PDF document text
    • http://persequen.com/zevimegevanemw9sk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_6026319e40cb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a0b0e3-3350-46d1-8ea3-815db8d3c38c/how_to_create_a_memory_book_for_your_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45fd4f3-0386-486c-a6b9-af04e61ee6c2/widuvidisazag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc4ec23-944a-4a1b-a9d9-d0ec07bd501a/48935589961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4b59b8-b3b3-4f54-b078-0c99d78645ee/how_to_calibrate_thermometer_on_big_green_egg.pdfIn PDF document text
    • http://tiliwadovi.epizy.com/bhai_film_video_songs.pdfIn PDF document text
    • http://jikeroti.epizy.com/hitachi_capital_corporation_annual_report_2018.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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 5028 bytes
SHA-256: 3afcb6dd4e8fc9548cf1256796c5b3f8b3ce8f1adba28659866f9a1da76900ab
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 12888 bytes
SHA-256: ac75cd12776e9327f66f53175b882227636be76ed2b6cdd5e53d0779948c04e0