Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65bc693f24e2ced…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 15:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3e757d61e4dfafc25fc05b443384dac8 SHA-1: 5046cb368d327bb3377e30c492f95e512433678b SHA-256: f65bc693f24e2cedc84d12c66499d439bca6f82f69404bf3d9f8b96ecf9a99ee
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious or SEO-spam content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to drive traffic or distribute further malware.

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://xezojetit.ru/wix?keyword=median+altitude+perpendicular+bisector+worksheet+pdf PDF link annotation
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/8897283.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/bamikal_xeradelefu_pemuzajivuwab.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/oracle_database_12c_administration_workshop_1.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/98477225402.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/904bd.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/wuwidimukinagijaxop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_6026203a9702b.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/Igcif50/34426244034.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/8491420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_604ae92667cbb.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/brvjggf/racer_classic_car_wash_detail_lubbock_tx.pdfIn PDF document text
    • https://jetefodakulerur.weebly.com/uploads/1/3/1/4/131453332/6552a.pdfIn PDF document text
    • https://sekepavikaforo.weebly.com/uploads/1/3/4/6/134608196/a547d6716e0c725.pdfIn PDF document text
    • http://didezidise.22web.org/ignou_ba_admit_card_june_2019.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/135b7.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/6716750.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/9085800.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/tekoto-kuzazurepitekob-fopibus-rokutedudam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabibago.rf.gd/43874758550.pdfIn PDF document text
    • http://rukaxeretipaj.epizy.com/a_thousand_miles_piano_sheet_free.pdfIn PDF document text
    • http://wogosozado.rf.gd/94228522265.pdfIn PDF document text
    • http://dexadusoxeb.atwebpages.com/how_to_calculate_area_and_volume_of_different_shapes.pdfIn PDF document text
    • http://kilirafesiva.epizy.com/what_is_the_purpose_of_sharia_law.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5544 bytes
SHA-256: c64f7bcee964df2d893b3b8a9385f0cff85223996c5528946a9bc22d6d56b6e6
font_01_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 10864 bytes
SHA-256: a5c6d5e06be9d0976148e011bd0ba01b6dd6913bb74df209af5e614ac874fe31