Malicious PDF — malware analysis report

Static analysis result for SHA-256 b069322aeaf9c55c…

MALICIOUS

PDF

75.9 KB Created: 2021-05-20 13:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7be75cdac6aad047554624c97537116e SHA-1: bbbfc292c1a2c4e298e6496d33702c059aa3174d SHA-256: b069322aeaf9c55ceaef2e7e94d3a1f7718a91c8fcedae86734e84396872b330
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing the user to 'nipisod.ru' for a supposed free software download. This URL is flagged as suspicious and is part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=typing+master+free+download+full+version+2018+for+windows+8.1 PDF link annotation
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/6253056.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/jovovasijo.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/vobinulevopoma_lalemubasimakix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fdcf09ab8b4c.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/01e59.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/ac0af7a0cce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_606caf943229b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_601ae78d0ce31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/blood_red_roses_c21fx.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/better_homes_and_gardens_walmart_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a191b5-cfd2-40c6-b161-ea1dfd178e2c/how_to_troubleshoot_a_hampton_bay_ceiling_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079b122d-f22a-4e14-91e4-013a25214214/tosugaresujibuxuxexaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e3104f-89e0-4f11-b718-83cf67b8f5f2/how_to_draw_cartoon_versions_of_your_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3e0106-9a13-4fc2-8750-3ef4a129e496/noxinipod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ef1e27-2ef6-4f94-a23a-eb3521edf7f0/zezitimigogowidatisuzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d860329-c58f-4c71-ada0-8e2763812423/4745573166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b151966a-46d8-445d-b69e-3690f9e4820d/how_long_does_it_take_to_walk_the_1000_steps_in_dandenong.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 6116 bytes
SHA-256: 472ac969898d61dfaa5bc614e530fe4cfdb78d4797cc639132dbedc2a05f9aff
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 12220 bytes
SHA-256: 6d3ea105199e57b6ee0b9031ca4c2eac1dc10e16c2fd6d6a378433700c5845f8

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