Malicious PDF — malware analysis report

Static analysis result for SHA-256 56913afcccf5d16f…

MALICIOUS

PDF

86.1 KB Created: 2021-05-04 08:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b77e03db87b8d3b7642de87f77a3dabb SHA-1: 248172e1e0dacd753fec2ec8bd1ad40b1fe37914 SHA-256: 56913afcccf5d16f90c1d61818eea9df96e78be75d4265b6efbc639249acd936
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and is flagged as malicious by ML and ClamAV. The embedded URL `https://seumenha.ru/strik?utm_term=how+to+start+coding+a+mobile+app` suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://seumenha.ru/strik?utm_term=how+to+start+coding+a+mobile+app PDF link annotation
    • https://cdn.sqhk.co/guzelatolina/vjjMhdp/xuxig.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/idjdYjd/2020_nfl_draft_live_stream_free.pdfIn PDF document text
    • http://wizimesataw.22web.org/92493549689.pdfIn PDF document text
    • http://wiloweredivon.iblogger.org/72165683909.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/ghOhd4D/barbie_dreamhouse_adventures_episode_2_watch_online_free.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/wimanagatuwizabulapowu.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Q7RidUq/83329172720.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/yamaha_dgx_620_price.pdfIn PDF document text
    • http://jokebixa.22web.org/azure_service_bus_connection_string_arm_template.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/53841208968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zumosupol.epizy.com/90752044691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e7337f-5233-402e-8ea4-4674b131044e/44982840102.pdfIn PDF document text
    • http://zopimejumujodeb.rf.gd/shark_lift_away_deluxe_vacuum_troubleshooting.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_c35f4c3ef3f7400eb7a47e2e6b406710.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b462ede0-dd8d-4660-8da2-117f47cd4f75/how_to_connect_logitech_z506_speakers_to_pc.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/nemuxagufomi.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/95822388492.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/50441902756.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_eaaba718386742ff87558a223d0812d2.pdf?index=trueIn PDF document text
    • http://divejekojo.epizy.com/jenavomaw.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/video_editor_software_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6a1dd3-d153-4d8c-9eda-94b79d25da8b/hp_elitedesk_800_g1_tower_intel_core_i7_4790.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_70a1ca26bd88498aa1ed5abe882d9ad8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5372 bytes
SHA-256: 30173b810ee0946c61fda9224848002903afd1544ea2db7e584eed875dec5ffd
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 11268 bytes
SHA-256: 35aea2cff8eef0e2f368cf2011322d12cf652040531c4e8b9cb27921d003f6bc
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378