Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7333e826e1b5b9…

MALICIOUS

PDF

70.4 KB Created: 2021-02-27 03:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 39a46637e62f0aad29d7670506af370b SHA-1: 1f32394b198829de2f875665c0774e770648509f SHA-256: 0c7333e826e1b5b97e6c412575c7bb20fbefd97ac463e0cf543bb7ca292ada50
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://dafemum.ru/wix?keyword=genetics+punnett+squares+practice+worksheet+answers' is the primary indicator of this malicious activity. Additionally, ClamAV detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further confirming its malicious nature. The document body, though heavily obfuscated, suggests a lure related to genetics worksheets, likely a pretext to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/wix?keyword=genetics+punnett+squares+practice+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/bupusudiva/fIqhfta/50255003321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_6038eec2d9e4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_60013a7360f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5fdf2d8e9c2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_5fdc409d66f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_6021fa9922640.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/fogibi/fuwenofuwiretamigas.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/xodakelikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/sinawemil.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/bose_wired_noise_cancelling_headphones_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/bus_travel_ticket_format_in_word.pdfIn PDF document text
    • http://dinijeti.rf.gd/54850785427.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/ncert_class_7_science_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/ap_french_vocab_lists.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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5300 bytes
SHA-256: 063f17406f30566ff231ede0c460ff1753616c8c816d67624d9cc8fa1417cb9d
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 9980 bytes
SHA-256: 9a08ba71e81f18236e7ff1e85da6066eafc59974228c880dc40240b782e50610

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