Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaa4c1ac7030764…

MALICIOUS

PDF

63.8 KB Created: 2021-02-15 08:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3f903b8a53c700b43d1832a304549c9 SHA-1: a61c13ec705b6db5c66f3a54aa774478dd541191 SHA-256: 3aaa4c1ac7030764dad99caabf4587381b7cd70360ba02867df248388227da58
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is likely intended to phish credentials or deliver a secondary payload. The document body, though heavily obfuscated, contains text related to 'calculus and vectors solutions', suggesting a lure to entice users to click the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=calculus+and+vectors+12+solutions In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5ff25be822a4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5feff1e2d72f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_6013d136de6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_6029ac90d8def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_5feafa60c82bb.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/mjiidYZ/54749224702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_60280836b98d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_601d799164904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fca3cb7d7d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ffa0e3526c22.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/hjjdYjj/xovato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fdbc4f5dee08.pdfIn PDF document text
    • http://befemuvejizu.22web.org/nurevaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulitogegitutop.rf.gd/bhutanese_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/liruzekagej.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/gejon.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/amadori_rearrangement_in_osazone_formation.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/6242882817.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_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 5084 bytes
SHA-256: 3197f07d0470d0a5f1eb5e73771879f0ad28871c1235371db7b066168579d64e
font_01_sfnt_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 10284 bytes
SHA-256: a94fe00ad05b1d2f7c331a1a27b9afed26c39f1dd9db45c2e95b215045b32b8f

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