Malicious PDF — malware analysis report

Static analysis result for SHA-256 07daa3ddc8d954e4…

MALICIOUS

PDF

93.4 KB Created: 2021-03-19 03:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e76fbee735d5649b118be1ae02720199 SHA-1: 98e209e7bcb0476661d47e30d847ffccbc60d594 SHA-256: 07daa3ddc8d954e4ff61605a51e97d1caa7fb8dcf62cc5ed9cb7b4e96c94659d
186 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 or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and appliance repair, likely a lure to encourage clicks on malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://golowaki.ru/strik?utm_term=maytag+neptune+washer+loud+noise+during+spin+cycle
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/8022557.pdf
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/9145078.pdf
    • http://tegor.xyz/what_are_the_8_logical_fallaciesz0w14.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/doxorowenepuloko.pdf
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/3463128.pdf
    • http://pink-echo.club/complaint_register_format_in_excel_sheet0qw0p.pdf
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/3651780.pdf
    • http://mekomob.getenjoyment.net/sixerukig.pdf
    • https://povewagefafede.weebly.com/uploads/1/3/4/8/134888055/2701147.pdf
    • http://fewudutizoxom.medianewsonline.com/rowe_ami_jukebox_200_selection_stereo.pdf
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/wojevukative.pdf
    • http://demask.fun/is_hp_deskjet_3050_an_inkjet_printersracs.pdf
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/1499400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_df123a15b9e043fd8e0419c14eeb0b95.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_30b7c98a7f19433bab587a2d19e1ec77.pdf?index=true
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_d4ff23728cba436bbdf10f1bb8c7255d.pdf?index=true
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_27f3ee1b0603423a9cef0e0c8e749ff8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ffb.bin
4eb8adb4e772b2489d296d32bc1c9d38890966d5037922134e4970220b3f3d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 5416 bytes
font_01_sfnt_off00013273.bin
d69163772dec0bb1e8a107fd59882743fb027e63c3047f921a76e1bf771da00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 10960 bytes
font_02_sfnt_off000157ae.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157AE 4324 bytes

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