Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58891d772bdcdab…

MALICIOUS

PDF

56.3 KB Created: 2020-12-21 08:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7a868fe46d9731323434ab4b48aad76a SHA-1: 440b47d6748799c648a46afc57ee29cd5f63057b SHA-256: e58891d772bdcdab51b34ec96e50d3b5dcfd1d753e4bbfbf68d29818a1000866
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing trojan. It employs an image-only lure, a common tactic to disguise clickable malicious links. The document contains a link to a known malicious redirector which, in turn, leads to a link farm of other PDFs, suggesting a multi-stage lure or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cctraff.ru/wb?keyword=stickers%20of%20five%20nights%20newest In PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/cc249995b921.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/1753799.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3382533.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/600131.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/5d609c6da5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7b7a28b9e860b7b22cdad/t/5fd652b4ab777271768cb272/1607881400103/avast_premier_offline_installer_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10751bdb33045eec30316/t/5fc5516e3c02f22b9dbc7dde/1606766958556/teputumijodax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1e1ae5a13e2fea6e261f/t/5fd6275f7fc52c20691cb01b/1607870304263/dangal_channel_crime_reporter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4b75c4-9733-453e-923d-491b8814e4f9/minecraft_pe_0.2_1_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3930c24a-d5a1-4f04-bc80-5d93fb958b1a/confessions_of_an_economic_hit_man.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdebfeb2dcd53187f206807/t/5fdf0cab7185ee572d55d2f0/1608453291942/drift_away_piano_sheet_music_steven_universe.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_off0000a588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA588 5220 bytes
SHA-256: d7e7961aa5e31b69b26339496a0655cc350539627c63f7aafad6c6176d614599
font_01_sfnt_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 8184 bytes
SHA-256: 61a7a44278379eac2835510a08422276e4907ad59e99f566fdc3d2ef4390a6a0

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