Malicious PDF — malware analysis report

Static analysis result for SHA-256 a782772b85db0f63…

MALICIOUS

PDF

78.6 KB Created: 2021-02-13 21:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d2bb69a4da1e842175009e70b134ede SHA-1: 91b8f62e7d6861d64a6a305e7e0bb11c765e1710 SHA-256: a782772b85db0f6306fc39683b413230db383fb1137e98d623b94f51abe1c2df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=ncsu+bus+schedule PDF link annotation
    • http://center-san.ru/8878466635xmoyr.pdfIn PDF document text
    • http://ru-payment.casa/rirujasppu22.pdfIn PDF document text
    • http://zoo-taxi.site/calendario_judaico_2020tgccj.pdfIn PDF document text
    • http://studytogether.fun/692383010990yfqg.pdfIn PDF document text
    • http://olivamebel.com/ullu_web_series_all_episodes3wh2z.pdfIn PDF document text
    • http://gabubixaj.22web.org/92701366819.pdfIn PDF document text
    • http://ridunculus.com/givukobavexadagemoxazuler4ijpa.pdfIn PDF document text
    • http://899themes-demo.ru/80922190136ffdef.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/72436954879uvtr4.pdfIn PDF document text
    • http://13millions-warzone.store/630733704133iwgi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_6024b5c5ca0f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/cozy_earth_bamboo_sheets_sale.pdfIn PDF document text
    • http://bolororufe.rf.gd/55028678415.pdfIn PDF document text
    • http://sebilazog.rf.gd/post_mi_guidelines_acc_aha.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/gehs_housing_allowance_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/challan_no_280_in_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/lalki_chunariya_odh_ke_video_song.pdfIn PDF document text
    • http://zutosagu.rf.gd/12309720027.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/sikizopavepijadi.pdfIn PDF document text
    • http://kokiralasido.epizy.com/xojifanifowilubama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 4832 bytes
SHA-256: 795aaf09b3179486f1978fee81bdac02bf641b514ac145448a4e437eab00cda2
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 11484 bytes
SHA-256: 8e2bcd942d982fed75fd91d4915dd6b98f95cb99144abec24a66a358d6dd9234

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