Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5475f085fa6683…

MALICIOUS

PDF

68.2 KB Created: 2021-01-10 14:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e8bfcbe9272692ce76a938a5088ba07 SHA-1: f6e06df5c003324186c3597c18624e84bf9eb6cc SHA-256: ac5475f085fa66833101f6fe2a00dc5da61557fed96dba280ed62a1bfe0ff8e5
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly subdomains, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document may also be used to trick users into installing remote support tools. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffset.ru/wb?keyword=ar%20line%20viewer PDF link annotation
    • https://relodigiluburem.weebly.com/uploads/1/3/2/6/132681887/037bc.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/2fadbdc.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/9ffa97cfd18ee.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/3iEedqY/30710660018.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/1NDhdih/47102272208.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/3165370.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/vulax.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/lizuseguwix/sabikutokegarizetukupif.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/65840813627.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/4901005425.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/adding_subtracting_multiplying_and_dividing_integers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/grade_7_english_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/gurovow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 3088 bytes
SHA-256: 50a40066e3fd739429712d64953dc2d3b4d0c3f6af266aec45137e97de1d96ac
font_01_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 4432 bytes
SHA-256: a1ac6c4cb15c6f517ce46bc0652e03147b7a19204577d95d0db34037034f2709
font_02_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 10140 bytes
SHA-256: 6bbd846cc17dff09a687ddf73c1a026311d0044928951f8ea2694777a0a6b84e

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