Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb81c226b79656bd…

MALICIOUS

PDF

82.6 KB Created: 2020-11-22 13:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a48e6417dee4d47b66e006a7840ec9b6 SHA-1: 00511cce2d907697079a7b8bfef443e5d9b35b9e SHA-256: fb81c226b79656bdcc2daaabee83fba47bc434fec4118d70430fdb1b60d11c56
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which likely leads to a phishing page or malware download. No scripts were extracted, and the document body was unreadable.

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
  • 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.
  • 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/123?utm_term=prepare+adjusting+journal+entries+for+the+year+ended+%2528date+of%2529+december+31+2015 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fa12d0de52a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fb8a927b1823.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/9112494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fa8cca246ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_5faf642c7258a.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/kekawu.pdfIn PDF document text
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/bumesunazukad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_5fb895395656b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68b29ce-269b-4076-b57b-69e0485e5e9e/49211655948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85291cd-977f-4453-91c9-01fbde6708bb/zixol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a33e474-e439-44fb-bf2d-a3c6938762d8/1190772140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fa8961-68b7-4e7d-94fb-8b91e42a8292/dead_in_5_heartbeats_rotten_tomatoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04a792a-4056-41f6-9945-0d2b796421de/maplestory_pre_bb_training_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dc2397-a6f2-441d-8ce5-0c298d2d178d/wefaxeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fbab23-d15a-4013-ae0a-7d965c438003/78627466347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532fe9e8-6fea-4fba-abb3-3af4185d9204/star_spangled_banner_piano_sheet_music_musescore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67d692c-5908-433b-b247-b36d509693b8/labitinowuvazotifuwitif.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_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 6656 bytes
SHA-256: bf4c7f84d1b4d758b2309cba30488b6603c07ece9df4c69023fd131ca9c2eb0c
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 11168 bytes
SHA-256: a8cc1960ac56bf5db259d7d53d6277c9b0e5df5c2bbae30d5d2d2f960bbfeca1

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