Malicious PDF — malware analysis report

Static analysis result for SHA-256 48439591cbc58891…

MALICIOUS

PDF

85.6 KB Created: 2021-03-30 22:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15a78cb345562bbeb57132ca40ede83a SHA-1: 786c4a1815d3ba515e52eb37232be6174cabe04c SHA-256: 48439591cbc58891371fe73c3f7d7ddcd16449400ac4479a5de8cfc4234c6e3b
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a mass of external links, many pointing to S3 buckets, suggesting a link farm designed to obscure the primary malicious URL. The primary malicious URL, https://bologen.ru/123?utm_term=glary+tools+free, is presented as a lure for 'free tools', a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=glary+tools+free PDF link annotation
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/6116621.pdfIn PDF document text
    • https://tewoxole.weebly.com/uploads/1/3/2/6/132695213/sakexo-deweso-gepemizapovo.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/f8ee8e9ce.pdfIn PDF document text
    • https://kebiluxo.weebly.com/uploads/1/3/1/4/131455508/2d72235f0fa69d.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/7da3aaa26591.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/tuvifu.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/luborinizu/41546427172.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/93065725655.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/bejovaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/77523686213.pdfIn PDF document text
    • http://fukemasun.epizy.com/vocabulary_list_environment.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/21952476809.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/this_is_amazing_grace_bethel_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/fuwonorofolikufoxituze.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/33864925528.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/webexpenses_user_guide.pdfIn PDF document text
    • http://bapujuta.epizy.com/6404176322.pdfIn PDF document text
    • http://sumimubilopane.rf.gd/gitemanowifogodu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/89023502850.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_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 4896 bytes
SHA-256: d09faaf8531ed604dfa376f344a3a4fdf71b2633fd9622056f37f8d6f9cae46d
font_01_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 11068 bytes
SHA-256: 6d7c2e9e5dd3f6dfd789ca8b775e1ef93645d59da686a309e32d98f3e602f184

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