Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbba67c8f87fdc1c…

MALICIOUS

PDF

83.8 KB Created: 2021-03-27 14:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177a152f7de8ae7ae54ae1a83c950bff SHA-1: b12661db65e113c585a1ce9098c80f51e63c65ac SHA-256: fbba67c8f87fdc1ce6e56906719b53788b08f961733f2535395a1e4749b7c032
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external links, including one to 'resalured.ru', suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'dna coloring worksheet pdf answer key'. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=dna+coloring+worksheet+pdf+answer+key
    • https://cdn-cms.f-static.net/uploads/4485450/normal_6059e2e28f968.pdf
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/106aed8e9c.pdf
    • https://cdn.sqhk.co/tavaxikanabu/gAjcMie/tevogatataku.pdf
    • https://cdn.sqhk.co/gizoxemovefi/jJihjin/walking_dead_actor_fogler_crossword_clue.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_602e26e360816.pdf
    • https://cdn.sqhk.co/wanadujogo/VheX4H6/17105159905.pdf
    • https://cdn.sqhk.co/tuseliwi/ibifH4J/rawepaj.pdf
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/tejenedizukewawaz.pdf
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/puwipikum.pdf
    • https://cdn.sqhk.co/ketifoseja/whjPrhc/xowamogekoti.pdf
    • https://numuteje.weebly.com/uploads/1/3/4/6/134683694/8c1d42bd9eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_71c5306f9316412bb67598edaa4135c9.pdf?index=true
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_f430fa8768e740c48f8378542ee622ec.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_b812711bc0d143038b2bfcafc24d4abf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44addfd2-aed3-410c-af44-2ca93f3ece4d/how_to_do_a_hard_reset_on_kindle_fire_7.pdf
    • https://uploads.strikinglycdn.com/files/5a07905b-1deb-4047-9470-f6ed21a58edf/pugevojotaponedizinit.pdf
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_853500daaba7420c860f56db6a49e41c.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_c7dbdbe358324a39ae38194837b26bd4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85a87353-4d6c-4145-9c49-319ad1ccf049/vintage_fender_twin_reverb_amp_for_sale.pdf
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_edb2f7b27f6f4fbeaf0155e051f5df3f.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_1100b08fadcf48a3b77f9815309d6c33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db8e5cb2-36a4-48eb-be94-e410cc253c45/gezudive.pdf
    • https://uploads.strikinglycdn.com/files/a79e3af9-5a89-4d6b-bcd9-28db4d4554a2/wizard_spell_list_5e_rpgbot.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_b1467ab2218e45f79a928aaddc475724.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a6.bin
1b4bb9aaee173d71a805409263f4cfbe385aa5b629b33aa9de878899db5f531e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 5672 bytes
font_01_sfnt_off00011c10.bin
9808ca5522a0359f5a453ab00648f6e836855f742fbe02532dfb04ad754df08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 10420 bytes

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