Malicious PDF — malware analysis report

Static analysis result for SHA-256 de172c626769fd2a…

MALICIOUS

PDF

99.4 KB Created: 2021-03-16 06:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 06d93226e0c1261b58628f9f19383a04 SHA-1: 1891ab0a9e1075bc8f9bdaf9ce4d797ddc5082f1 SHA-256: de172c626769fd2a115ed88692756f8f620ff793463564a30e142cd510b07be5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://fokemale.ru/strik?utm_term=ancient+greece+olympic+games+opening+ceremony PDF link annotation
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/2955854.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/855821.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/nuxujapabesuwopot.pdfIn PDF document text
    • http://xapunubezes.iblogger.org/29651635175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_602fa49a18f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_5fe84cecc6da9.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/melalezunurejirupe.pdfIn PDF document text
    • https://dubuvolikumo.weebly.com/uploads/1/3/4/0/134012832/tazipazebodabuketate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fd2df56a9596.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/6a9737ed.pdfIn PDF document text
    • http://lusivemewuza.22web.org/introduction_to_probability_worksheet_tes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_603d039a4a51a.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/e01f6c5eac.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/tivar_werileti_mefefiwufij_gedelomexivar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_0a00ad793da84506a43e2f6426ef69c7.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_83fcbedd1da444f8a1d8629e1778e9c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca56769f-e88a-4eb8-941e-d47ea526436a/us_army_new_apft_standards.pdfIn PDF document text
    • http://lejibop.rf.gd/a_streetcar_named_desire_writer_crossword.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_24c2a6af0ab24259800b5c2adb29525a.pdf?index=trueIn PDF document text
    • http://lonidur.epizy.com/zowakiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ae2a4f-59da-4f6d-887a-1bb110659c7e/wobuwebopasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4627aa-b4dd-4de7-a8aa-d9f480cb5389/bedtime_stories_for_babies_in_the_womb.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_8b0c265043e4407398430bd90412cbfc.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_off0001446a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 5344 bytes
SHA-256: 4678d5b12fca1cc0a8fefea390ea04aba2e101178a6fb7e98a6c94b552e488dd
font_01_sfnt_off0001568f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568F 12520 bytes
SHA-256: 5c11d178722c16874f28e68f8c27f5e2337777815eae877e9e1383ab3afcee1f