Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2456ac3d871dcb8…

MALICIOUS

PDF

68.5 KB Created: 2020-11-13 06:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4955658c42bb065bf5b2f591f1a9bb6a SHA-1: dcf7724c51908ba56c16bb6b1742ff063a229bd7 SHA-256: b2456ac3d871dcb874f82a734cf1858df26f1389aa7ac028f6db16f013d391a5
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://trafffe.ru/strik?utm_term=philip+kotler+marketing+management+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f987a4de302a.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/babejuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5fa749e7ee243.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/sifop.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/9234534.pdfIn PDF document text
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/5535705.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/xedewofuretujo/fibagiwepenotiwekubem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdf8101-99e8-4221-9911-7562d59b90e6/98776867578.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/minty_axe_codes_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c73f37-b97a-4a94-b873-e16e31e7a813/subakijusotenaminev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5563157-155e-42aa-999f-4fe3c999f151/67885837851.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/food_to_eat_on_keto_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/zigafafumejasavetugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d42cbfe-437a-48a9-ad3e-3ecba6c7844e/78068147397.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/jurelizalorifo.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/dizijipudixufopoduwefe.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_off0000c26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26C 4960 bytes
SHA-256: 3aa3dc4cd2f83cd0d51a9c947b145e792ae60df96667bb050f80929adf252525
font_01_sfnt_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10272 bytes
SHA-256: 033c4f6899b8b291e725270f83958c39c78b75529796bab458dee354afb71910
font_02_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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