Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d0ea2888c9477…

MALICIOUS

PDF

121.2 KB Created: 2021-03-23 05:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cdb67a1f9431db13dfc9bfa5212b3b3c SHA-1: e4f86a155feac1978c4578b6952a48dde8f6fa8a SHA-256: b64d0ea2888c94773a2c94d3ad96a1b8304fadc2e0ce1af0acfe2d0ed4d5ee17
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

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 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://gimoguvi.ru/strik?utm_term=old+testament+story+of+abraham PDF link annotation
    • http://smartcreditscore.info/american_journey_dog_treats_near_melnzha.pdfIn PDF document text
    • http://malipawiw.22web.org/mi_planta_de_naranja_lima_descargar_libro.pdfIn PDF document text
    • http://letnesil.xyz/what_does_mystical_mean_childrens_dictionary4qz6e.pdfIn PDF document text
    • http://airbin.top/plague_inc._cheatsuvrry.pdfIn PDF document text
    • http://100p-f.ru/badaderagowu0l2re.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/netgear_wgr614_v4_manual.pdfIn PDF document text
    • http://xegafutulon.iblogger.org/sakhi_bike_song_telugu.pdfIn PDF document text
    • http://mijuxub.66ghz.com/google_books_death_in_the_afternoon.pdfIn PDF document text
    • http://helplnstagram-confirm.com/mcgraw_hill_physical_science_online_textbookhqqch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pajipiruk.rf.gd/intellij_shortcuts_mac_cheatsheet.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/38831188155.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_02043f2cf90d4e38bc63f2a0c099489e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c52a7b-5337-4f6e-ae5b-014c802dbd58/67305555662.pdfIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_e1fbc0eabfb447528caf5e1bd211d62a.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_79ab647c77bb4ec5b55c92137e5ed092.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_a494eb74093b46f5ae6094bcf1ce9855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c38bef-046a-4af1-a892-e932e7a98750/nivibefabiwavobuxozuk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17674 5416 bytes
SHA-256: 99a22b418e32d900b8729d8ddeea2b456a1444ff566d132c465af9c5d0805a58
font_01_sfnt_off000188b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B5 18800 bytes
SHA-256: e4c614866d276f5592932a49ed2290807d1a8c141d60754680d0694b39df25c2
font_02_sfnt_off0001c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0EB 16784 bytes
SHA-256: af3b4e228838d0a0c304493d9bf8117f82243591f1176a984c4014fd04b4d878

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