Malicious PDF — malware analysis report

Static analysis result for SHA-256 70772da6d357e690…

MALICIOUS

PDF

76.7 KB Created: 2021-03-03 02:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5df2011f9ac70420d43a4d68df821cef SHA-1: a1b7d6c3534ef509d77b5df16bd302b0936563aa SHA-256: 70772da6d357e6900d899671321dca8f0dd7bda4239b273c9edb0cbae9526ca2
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including a critical alert for linking to known malicious redirector infrastructure. It functions as a link farm, embedding numerous URLs that likely lead to further malicious content or phishing sites. The presence of a link to 'dafemum.ru' with a 'utm_term' parameter suggests a targeted campaign, potentially related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=2nd+grade+common+core+math+subtraction+worksheets In PDF document text
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/bajodusoj_boxikopa.pdfIn PDF document text
    • https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/ebc76e84.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/npifhfT/ear_doctor_clinic_hospital_games.pdfIn PDF document text
    • http://buvevolu.iblogger.org/vikarex.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/2cbc7a3b993197.pdfIn PDF document text
    • http://maxonona.22web.org/terapa.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/7452108.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/01b630c4408df.pdfIn PDF document text
    • https://dofabogadu.weebly.com/uploads/1/3/0/7/130739956/6504f9beb42eae.pdfIn PDF document text
    • http://shoop-fe.ru/515832461227jp43.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/2whiiju/la_dodgers_logo_pictures.pdfIn PDF document text
    • http://housefashion.ru/annabelle_s_homework_piano_sheet_musicmbsow.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/geRosif/92108268225.pdfIn PDF document text
    • http://davilebut.66ghz.com/lasokogu.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/kovigilexinavu_jopirenujisod_jukelilenam_gopevajusubul.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/hjJtejd/baby_yoda_squishmallow_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarusuja.epizy.com/88244266235.pdfIn PDF document text
    • http://wowemipawugese.epizy.com/tibeladidupafige.pdfIn PDF document text
    • http://motinekan.epizy.com/90104719028.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5652 bytes
SHA-256: 24c7710932c0b678f7a8255a507c43acfd8134774893fcf60e94c5c4f8a9ed20
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 10968 bytes
SHA-256: 1328dc5e4e4b8a920e1e7b76f154625948c4dcf4c169857c6ca6ad7530f35424

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