Malicious PDF — malware analysis report

Static analysis result for SHA-256 990d613f352521ef…

MALICIOUS

PDF

67.2 KB Created: 2021-03-16 04:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7137c1876dbe6695c439ef3153a54377 SHA-1: d8835babb90e7d28e4755a428ab34b535dfcfc65 SHA-256: 990d613f352521efcb48f6d787d91f29cc12107179d4ef5c38ca76dabed79522
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and exhibiting characteristics of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://kuzutuzo.ru/strik?utm_term=kenmore+gas+dryer+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/muwunupudi/Aig1ajg/wovun.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/innovative_business_ideas_in_pakistan.pdfIn PDF document text
    • http://xidotamasaw.22web.org/90674849638.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/Vxgcgjl/best_cruise_ship_stocks_to_buy_now.pdfIn PDF document text
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/1887388.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/mhhiFLB/planet_acheron_warhammer_40k.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/ie4jghb/jomivobusetamogov.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/what_to_say_to_a_woman_diagnosed_with_breast_cancer.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/3eb4f55a67a7d99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafibuwed.rf.gd/41736605511.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/speechless_violin_sheet_music.pdfIn PDF document text
    • http://zovopabipani.rf.gd/moana_cartoon_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/magnetic_metal_sheets.pdfIn PDF document text
    • http://rolezudebozi.rf.gd/annamayya_hd_video_songs_free.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/driving_school_2017_apk_android_oyun_club.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/bomixazatininimaxedumenur.pdfIn PDF document text
    • http://javodorudorujiw.epizy.com/lier_plusieurs_ensemble.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/25302551269.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/how_much_is_a_2020_camry_hybrid.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_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 5464 bytes
SHA-256: 2e3047a315deaa68cf074002cb9994305417dfe2b80724065ee41c582946ef6d
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 9548 bytes
SHA-256: 2029552898fe51aeb71b075178fb7d920ea6ff5548426e0fb60c2c059b34a030

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