Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca79a3c8bcb6c23b…

MALICIOUS

PDF

64.0 KB Created: 2020-11-26 00:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7acb45e4b40d93f5f5feca1130082b75 SHA-1: 2289365e1c2efa271723788a2d2e550c1243f27a SHA-256: ca79a3c8bcb6c23b080924c839e43f070b908a8c0167ac2f63575e8b67fafd3d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://traffnew.ru/strik?utm_term=champion+league+ringtone PDF link annotation
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/00ec9e32372e0c.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/321ab.pdfIn PDF document text
    • https://lomurawejajiku.weebly.com/uploads/1/3/4/7/134732321/kemog.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
    • https://s3.amazonaws.com/kofabube/reddit_best_reader_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d536d6e-3abe-4fd6-9088-80578d1c48ae/pycharm_raspberry_pi.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/form_to_give_up_child_custody.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/solicitation_letter_sample_for_caroling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14d23b0-c8aa-4a87-8150-1f225f9b22dd/34989785901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12dc5be1-818a-411b-9ad5-61b5787e2148/74793012671.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/buy_baby_tiger.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/80649424597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cd56d3-f667-47a8-b790-fe6a134dcd6a/59165849839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908794d2-b682-417d-bdd7-e8d07db417c7/Beschwerdeverfahren_wegen_unlauterer.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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 4960 bytes
SHA-256: 8cf972b84b3bf6b9179ff97b7df37c548ca6d4d0f729716ac4f3c1341bdcb67c
font_01_sfnt_off0000c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC237 10288 bytes
SHA-256: 07461414bbc205fee29b60ad8027bd412696077c14001d9863a53a90117699a4
font_02_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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