Malicious PDF — malware analysis report

Static analysis result for SHA-256 df750ec7b5f67e48…

MALICIOUS

PDF

72.8 KB Created: 2021-04-02 19:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fae4cec72a4a3d81bd02fda5ca7bea03 SHA-1: e3760b3449c35c290112c32ea149152126325464 SHA-256: df750ec7b5f67e48015fab8dcf9d616838ac3006d728f7776f23008381df40c1
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users. While no scripts were explicitly extracted, the presence of numerous external URIs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=mcdougal+littell+inc+world+geography+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485296/normal_604014d2b3a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6033b8ab7b483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_60652c278b84e.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/92491654237.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/riwegimabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_605d9486608f6.pdfIn PDF document text
    • http://online-bestshop.xyz/44685012828hetk2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fd265e05dd5f.pdfIn PDF document text
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/6143c30fbed.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/english_words_with_noun_verb_adjective_and_adverb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_6035064af3e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6038bee0eb25d.pdfIn PDF document text
    • http://spindlndou.space/roritusenulosaralutijikuk04y98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_604cf02303f0f.pdfIn PDF document text
    • http://ionatr.space/gilubovajemonunafesuku44pzd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_603290b87fb89.pdfIn PDF document text
    • http://islemleriniz.org/genitomotukodizekesefanixda.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/gupakelofimukoxipimilutes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6026609ab52dc.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/e6a324e9c81830.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/2006993.pdfIn PDF document text
    • http://reduslim-ordina.site/behringer_pmp2000d_manual02laf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/5557072940.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/barbell_upright_row_form.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/hallelujah_flute_sheet_music.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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 5532 bytes
SHA-256: f72f0f20c39f9f112b89519fc25c85782c92db66b72055a86040b499d469f17a
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10804 bytes
SHA-256: b736cfdaa5504349c5362efca364f710311552c0bd560af37fe5d1f5d8453464