Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c1a908def9e9d5…

MALICIOUS

PDF

80.2 KB Created: 2021-05-22 00:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3218905d28850610b78149b3c4845807 SHA-1: df49ac202e5469b2d1066106e09451aae345582d SHA-256: 70c1a908def9e9d5b7f7f3bd6644c2e914f0680588595c973387a9d931374833
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential SEO link farm or phishing lure. The primary URL, https://xezojetit.ru/strik?utm_term=how+to+read+ultrasound+report+of+pregnancy, is presented as a redirector for 'free-download phishing'. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=how+to+read+ultrasound+report+of+pregnancy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483071/normal_606ea2684daf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_6009982c7d43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_600d58c82903e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_60504c787a27a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fc92f82e3ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_602466c3d87d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_604397f31f3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fced0632b4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe9ee1360648.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/seregiputaj.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/luzota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_6044d851efcc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5feea2b6117f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_6037ce5d9b612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_605604a85462e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5ffe985e4b792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_605f50a875a35.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/gofilafixu/bifepajojexoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/animal_adaptations_worksheets_ks3.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/how_to_factory_reset_englander_pellet_stove.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/zanojegepovorakumopusiti.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/49736140068.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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 5476 bytes
SHA-256: fe5da01311e80e8676f4e7495be0812f0c0218df574f02100e7f09c6f90be219
font_01_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 10808 bytes
SHA-256: 82506ddea24d081e9de9cdf345e183601104759bf0f9efb6baa22a82754a8fa0