Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a11c25fce6a4ae…

MALICIOUS

PDF

76.3 KB Created: 2020-11-28 18:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 29145c5fb1379820f1fc6493fc0b11af SHA-1: 0817dc073c0e4389b67e1f4b1bbd343a86e50dde SHA-256: 77a11c25fce6a4aee9daf6e4c52a54ea36459c3a30a2c6c7891c807fd4663470
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=android+tv+games+2019 PDF link annotation
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/6232753bbd.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f8e2e7002bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5fbdc2b8e67a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_5f9c4ea0a5d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f9edd2e7374c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_5f926f29d0ee9.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://uploads.strikinglycdn.com/files/3ccad790-29f1-4024-96b1-f4487b38a22a/tefojutarolinabexujaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5d384c-6c29-44d7-808a-d44c5616bf4c/maxoxalekolikazimuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c12aaa7-ed10-4821-a2c9-54e7a2f3c084/spotify_on_roku_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/zavesoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb0800f-0581-4f73-b151-c5b8496c46b2/gakaxozexolar.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/solar_panels_charger_harbor_freight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a8a28b-5cab-4275-b079-6f3f080f4755/sitavozuretavegawuvejuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72623a1a-d16c-4260-a47c-d3a322ec090a/west_coast_wildfires.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 5432 bytes
SHA-256: a09703857d54b8e9c8bc1d8b32d53266529c93398df2e45d5c62fd7e134d73cd
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10300 bytes
SHA-256: f39a06895e24d1bb5f8f0d1f6611ae868e3355dc5780986de5e545e1b48ba0ae
font_02_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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