Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7e4b0990487d52…

MALICIOUS

PDF

75.8 KB Created: 2021-02-22 00:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47cb48aa3ed095d1eb090e1f30b6fa6f SHA-1: b47c105104a8583f432fb9fcba498b00812cc67d SHA-256: 8e7e4b0990487d52e78d0c1d9cc93cb078df79e5737b3fedcf88b32f157d1537
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as a phishing trojan by ClamAV and an ML classifier. It contains an embedded URI and is described as an 'Image lure linking to an SEO redirector (free-download phishing)'. The document body, though truncated, suggests a lure related to 'ap physics textbook answers'. The primary IOC is the redirector URL used for the phishing lure.

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
  • 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://druttle.ru/wix?keyword=ap+physics+textbook+answers PDF link annotation
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/36da9c0566.pdfIn PDF document text
    • https://bijafifevidajun.weebly.com/uploads/1/3/6/0/136051066/jobix.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/fepaketipoki.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/aeUuXMH/gupilorotumuwoki.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/classifying_animals_worksheet_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/igahfRN/64290349225.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/Ihb1mhh/9112244955.pdfIn PDF document text
    • https://derigogo.weebly.com/uploads/1/3/4/0/134017063/zovevojij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puwagof.rf.gd/rabugitesibebelu.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/keninilojo.pdfIn PDF document text
    • http://jevopuvejamiv.epizy.com/nobadavudosugonemabuzun.pdfIn PDF document text
    • http://folujas.epizy.com/73745214439.pdfIn PDF document text
    • http://fofebur.rf.gd/casio_fx-_83gt_plus_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/befojalakad.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/51361770399.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/zununa.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5232 bytes
SHA-256: a57a0521625b5993987dfa1c6225b6c2c6aae0f036fde357e83264323a06176d
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 12128 bytes
SHA-256: df6fbf5daf359352c3668ed77aeab02006967a7f81ed85724e09a4bf559e4e1d
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.