Malicious PDF — malware analysis report

Static analysis result for SHA-256 24998059166a17f8…

MALICIOUS

PDF

74.7 KB Created: 2021-05-25 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 60d8c2f602e4b15b48ee7c0c047b6751 SHA-1: a5edb4342ad129df55cee3fec0100dfea1f99093 SHA-256: 24998059166a17f8aff8abd736744fadf2f9c063ebbadd042ad031b946c585de
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains a URL that acts as an SEO redirector, disguised as a link to a biology textbook. This suggests the primary goal is to trick users into visiting a malicious site, likely to download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=biology+9th+class+text+book+pdf+ap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601df48d9e59d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_6008c7b222376.pdfIn PDF document text
    • https://jezosodakadofa.weebly.com/uploads/1/3/4/3/134376186/nafowinebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ffa8ae7acb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5fe9ff004ce13.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/ed5911b6615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60114c00caf3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_605f3a3b1030c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_601172ccd82ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_60031a1645b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_60120a5db3818.pdfIn PDF document text
    • https://juxivuvamefuba.weebly.com/uploads/1/3/4/6/134694829/refigulikatadax.pdfIn PDF document text
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/0b495f9ebee2.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/dejazuvorira/37539579081.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/63340802203.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/charlie_malayalam_full_movie_mp4_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/17314299072.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/80219867249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcded914-d930-4cfc-ac07-b868434de261/my_steps_are_not_showing_on_my_garmin_vivoactive_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b16f7d-5f4a-4891-b72c-969e87b8c252/black_and_decker_waffle_maker_3_in_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a95b89-d294-4d2c-9087-4e98bda00943/mekidetime.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/ac_market_free_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/sojikufosibe.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_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 5900 bytes
SHA-256: d29b22732954c926d66602e5bef01496e4eeb42dd9982b73df92ecda3f576889
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10684 bytes
SHA-256: 03254f49914c340d8501a34ecb75ce1eaed2a9dce1d3fb4997702418d48806b8

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