Malicious PDF — malware analysis report

Static analysis result for SHA-256 404cb05fb40e804b…

MALICIOUS

PDF

66.4 KB Created: 2021-04-12 01:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03ac10eb069b9f8ab68b4c21a7d35594 SHA-1: 938add2a03d6898e939ba014598ebe3e5e392a04 SHA-256: 404cb05fb40e804b02072caf9ce12a7e637bf0f574b55a55cecedc181c3a145f
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 or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=casio+sgw+500h+price+in+india PDF link annotation
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/3937124.pdfIn PDF document text
    • http://xojavuwolow.22web.org/assertiveness_vs_aggressiveness.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/3ba2a6ec958c.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/8851704.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/7551091.pdfIn PDF document text
    • https://jipemovikeral.weebly.com/uploads/1/3/4/0/134012889/e9997b52dbd9f.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/89449c7ec61255.pdfIn PDF document text
    • https://lariwajiko.weebly.com/uploads/1/3/4/3/134316624/zefamepefafedijir.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/thug_kitchen_cookbook_author.pdfIn PDF document text
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/6019241.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/7024825.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/d82430588fd1759.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/657973.pdfIn PDF document text
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/7353650.pdfIn PDF document text
    • https://mamotuzukaw.weebly.com/uploads/1/3/4/4/134438076/vumifuvob_pakaroven_varewik_buzinabov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudosuvosav.atwebpages.com/animal_camouflage_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5479c0db-6ef9-4759-ba5e-64a9f0eb8075/samerideramiv.pdfIn PDF document text
    • http://siwojanapav.epizy.com/newoxugomoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5531eed-8c61-4b9f-800f-38a885a0cb7f/sijuwaxanajopeba.pdfIn PDF document text
    • http://puwodadivuxasaf.epizy.com/basagalevutemib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf63dc19-7e77-41bf-93c2-8afba0afaa12/sony_rx10_iv_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596dab53-0143-4d87-ad3e-b692dbc43a21/what_are_the_advantages_and_disadvantages_of_transformational_leadership.pdfIn PDF document text
    • http://xefemolagu.rf.gd/how_to_relieve_sciatica_pain_in_bum_cheek.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_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 5568 bytes
SHA-256: 817e964171b3b4fcfffabf0537fc29e1e0fd9853f4bd2ddccb0139fb892aba3e
font_01_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 9892 bytes
SHA-256: 598daac08bf852c76815d92cc75d8c79883e4039ef3a173bd782f934013eafce