Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587aa04ece8908f…

MALICIOUS

PDF

64.7 KB Created: 2020-12-02 11:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f0141c4c6da09b0a829e69c760a01d SHA-1: 554d8508c3f6ddfdab984af97585c33273ce368d SHA-256: 4587aa04ece8908f31104304de51470bb06e7bd67c17866823f9558b9a11945a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=summon+nature%2527s+ally+5
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fa172b026ee6.pdf
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/lisavagowez-xukevunej-kavijokanetap-kimumuvumogimo.pdf
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/9f63a95.pdf
    • https://berovifis.weebly.com/uploads/1/3/4/7/134730871/6cc6b94b55.pdf
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/jezet-vokod.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fbd3c821e8b6.pdf
    • https://bixivotanaxifu.weebly.com/uploads/1/3/4/4/134449973/0f60b082061e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f7a8294-3962-4fb9-912a-3b5f1f9b4db7/mupaforit.pdf
    • https://uploads.strikinglycdn.com/files/b042c142-486d-48ac-9f17-38b8d255fa4d/18751554206.pdf
    • https://uploads.strikinglycdn.com/files/8353580a-f875-457b-9910-83cf93c8cd25/navutanalogerujegisabanun.pdf
    • https://uploads.strikinglycdn.com/files/bb7e214c-6788-46bd-86ec-1b3c6beb4e9d/16174466890.pdf
    • https://uploads.strikinglycdn.com/files/ab1eac28-8dca-4f49-87ed-9e87f6d5f5bf/ecuador_crime_rate_2017.pdf
    • https://uploads.strikinglycdn.com/files/b31877d8-4e1f-4f7d-8936-5dcaf1a46ae0/38014792542.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f2.bin
e17c460fdc97cd9116bd800378c26c61f9bf623262b10fb5d199af7a56e163a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 5196 bytes
font_01_sfnt_off0000d394.bin
2088c92b2b6379fb2c6771cfaba072db4a0b3930097019d1f379a5f1b3adba40
pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 10160 bytes