Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf65884532250c1e…

MALICIOUS

PDF

83.9 KB Created: 2021-03-10 12:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b44e598187daa610e083f5e2018bd1c SHA-1: b06503be499bbe161331b2d5c208a9f56437eb73 SHA-256: cf65884532250c1e15d22f3a20e35c0018869887a5cf7f8bb2cb865c91c890f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is detected as a phishing trojan by ClamAV and a machine learning classifier. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting, specifically using the lure 'Fortigate matrix sheet'. The primary malicious URLs identified are kuzu.ru and tiwilib.iblogger.org.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/123?utm_term=fortigate+matrix+sheet PDF link annotation
    • http://tiwilib.iblogger.org/cobra_29_nw_ltd_classic_cb_radio.pdfIn PDF document text
    • http://fifamarketbot.com/murottal_al_kahfi_muzammil21zbc.pdfIn PDF document text
    • http://f13x.xyz/33539454003ody3g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff28e4053eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffbcfbb4d81e.pdfIn PDF document text
    • http://vivaxuza.iblogger.org/17506624687.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/surivamesidimom_fuzeki.pdfIn PDF document text
    • https://luweregovim.weebly.com/uploads/1/3/4/6/134661757/pabiwezuvuxaxemok.pdfIn PDF document text
    • http://linza.media/relative_clauses_defining_and_non_defining_worksheet4oo7e.pdfIn PDF document text
    • http://leyloften.online/machine_learning_for_pythonjp147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_602293f3e5031.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/nogeguras-nabefapu-badise.pdfIn PDF document text
    • http://idealslimitalia-official.site/sisasewubolyt8qm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/busutafitufe/95074350182.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/animal_song_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6dd05d-a5df-4645-88be-79849a8e2e65/how_to_start_keto_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfb6f32-938f-4d5d-b9ee-d18e6886f268/kuruwe.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/eaton_fuller_transmission_service_intervals.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/cheat_droid_pro_apk_no_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ffa9d0-b322-4f3c-9441-c3f50f065830/lubabawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d267fc1b-1923-43d5-a3b3-ea6d20e6e7ae/14433841131.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/wajifadilevolukeseguvo.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 4772 bytes
SHA-256: 792b1093b457ab1ec2f7c04904da05e8fcd1dbbdba5d9f1a5bb3d8661376032e
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 7956 bytes
SHA-256: b9ec09b37687d2b6fd4d0bb4fdfa02eda188b2be7016ee9378e6df8f82f6a9db
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 10924 bytes
SHA-256: 46c844cab1a3da49a0d0b64396a884a6cdc34314c6af2c2920f41a49b1eb679c
font_03_sfnt_off00013360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13360 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e