Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ff3ab72e7db27e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 11:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 563ced47db09f30394ab32ff7167a34d SHA-1: 9044098fece1cafe651e6cbbd54dbd55e05c2efb SHA-256: 67ff3ab72e7db27eea156c16eb32963a46d619acd037649e17d3b5457f21f21a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/award?keyword=cutting+edge+advanced+teacher+s+book+pdf+download
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/e65cee2f7.pdf
    • http://pexarinolal.mypressonline.com/quote_as_a_man_thinketh_so_is_he.pdf
    • http://bet-info.ru/larekigogodore1azsr.pdf
    • http://nitiwomifigurod.mygamesonline.org/82830170590.pdf
    • http://dabukim.mygamesonline.org/95482203545.pdf
    • http://paxezot.getenjoyment.net/kanifometogovunife.pdf
    • http://vzroslyh.net/2006_american_buffalo_gold_coin_valueg3uap.pdf
    • http://fakutuzogazu.sportsontheweb.net/attribution_theory_psychology.pdf
    • http://koxelovanalimu.getenjoyment.net/cement_plant.pdf
    • http://coloradocustomelectric.com/lanogevonumyasre.pdf
    • http://housefashion.ru/xulatebipomawii12jc.pdf
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/3931862.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/1799509.pdf
    • http://latuha.com/mopewebizesg8wn.pdf
    • http://nifimoperokoj.medianewsonline.com/st_caste_list_in_ap.pdf
    • https://fupewipi.weebly.com/uploads/1/3/6/0/136091895/b13467fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://saxodanokijaj.atwebpages.com/d-link_dir-615_technical_specs.pdf
    • https://uploads.strikinglycdn.com/files/23cbb21f-076c-4ebb-a320-b9acda261c90/derechos_humanos_en_ingls_y_su_traduccin.pdf
    • https://uploads.strikinglycdn.com/files/f535bbdc-e1c5-4216-b9cd-724d3f5feae2/how_to_increase_my_desire_for_god.pdf
    • https://uploads.strikinglycdn.com/files/f5f2491c-3c31-488e-b1a9-b510d148fec3/pretty_little_liars_season_1_episode_15_bg_audio.pdf
    • https://uploads.strikinglycdn.com/files/0b1aab3e-53c0-4d34-b7f2-0d7122cb6b1d/how_much_does_it_cost_to_run_a_delonghi_oil_heater.pdf
    • https://uploads.strikinglycdn.com/files/635a0883-d8aa-4a2e-88f2-a869d03dd9e3/2019_club_car_onward_dash_kit.pdf
    • https://uploads.strikinglycdn.com/files/3645efb9-e303-4e23-a8de-f64da610c138/laforutobuzafeki.pdf
    • https://uploads.strikinglycdn.com/files/ca72ac6c-84ac-4215-8a53-b8bc9c33c303/sap_open_inbound_delivery_report.pdf
    • 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_off0000e7db.bin
4d968b5c39c636ab135f1f9011641a16d2cdf54eb5bb0962224cd2625f3553f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 5676 bytes
font_01_sfnt_off0000fb35.bin
fa812c0ad51c47c5548e06ca006621bfb4010a78aef39f4fc0e3e26152a29948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 11044 bytes
font_02_sfnt_off000120ff.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 4324 bytes

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