Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f70ff9f5d4e381…

MALICIOUS

PDF

69.8 KB Created: 2021-01-08 10:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0beb76fe09c01f8f7c2343674c376a7b SHA-1: ed91a0c477e3e79dd78859e9a27a0c933a5c4618 SHA-256: 72f70ff9f5d4e38144c27459bc9337c4f456fc88f343dd5a68fe579dc1605cb1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised with a lure for a popular Android application. This indicates a phishing attempt to trick users into visiting a compromised site or downloading malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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 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.
  • 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://traffmen.ru/123?utm_term=tube+mate+apk+download+free+for+android In PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/8171808.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/9839233.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/gifGVgg/pocket_frogs_play_online_for_free.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/e70902956e50.pdfIn PDF document text
    • https://tenetowebobidiv.weebly.com/uploads/1/3/4/6/134635535/tupig_bajuloxapug.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jfNibuS/xovenarubegaj.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/fuxowetipale.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/06c33964-39dd-4875-bcaa-91ae15e993ee/gepijuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/form_c_frro_office.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/2989806442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3079ecb6-d0b6-4c2d-bf0a-66920c8cefd0/zojemutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f8ae80-a45e-430b-9c0a-246e8514bea7/wogafam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbdffeb-1c51-4834-9476-d70e2c2e5b60/shield_of_faith_5e_wikidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d870cf-40eb-4f0d-ba87-4ba7ce10d812/brunette_pink_chastity_cage.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/gagunozazuxafomujezata.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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 5256 bytes
SHA-256: 4750077f26508818d2ad1f2bbc0e9ef6fce3c17ddbd543aa192a3ec3178218fc
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 10936 bytes
SHA-256: 8bb802aecd9536fc89687d9de6d4055dd5442efca774094f52235b30e68961ed

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