Malicious PDF — malware analysis report

Static analysis result for SHA-256 6533da1a57745e13…

MALICIOUS

PDF

75.1 KB Created: 2021-02-17 04:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c35d5a79ab4bfe8d723e920a3582f79 SHA-1: a3089788035d4979be0777e056ae2fe2e60e3923 SHA-256: 6533da1a57745e1376c06c348e3d22d02d484118a19dd44012629996ccdedb78
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO spam tactic. The primary URL suggests a phishing lure related to home safes. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wb?keyword=does%20costco%20sell%20home%20safes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5ff39dc9baee1.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/qqaIogi/77669955246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_601be7ce7e146.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/lPlvfhd/92651979351.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/iaOgfie/6740193775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404108/normal_5ff188070f678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5fca2a6de5449.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/ASmhfam/silver_dollar_city_branson_mo_rides.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/vodekagofimakag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_600fb61873527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fc7ca946fc5a.pdfIn PDF document text
    • https://subegawi.weebly.com/uploads/1/3/5/3/135394411/xosubomebedupotigotu.pdfIn PDF document text
    • http://helpverifedbadges.com/medical_medium_liver_rescue_free2d2lt.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/bifamomove/14434596846.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_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5024 bytes
SHA-256: e0f1378c1adf3d844e7e1496d8cc38972407f8161f2a1456e9ea4c4ad1b703ef
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 16932 bytes
SHA-256: b980d55b448fb13c40fc1bd14b835683c725bb1a4d4afd3be7bf9b8025ca8f3b

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