Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23d932f72b95ac3…

MALICIOUS

PDF

73.0 KB Created: 2021-02-28 13:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0341f71f0fc5e1979bef33b28aa03ade SHA-1: 72deea042ecf9a02c67ea53496a2bde7fb19882b SHA-256: c23d932f72b95ac3537b01fac2e5a2de0aeb8c017124dad6d38512bd2d3646de
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to manipulate search engine results or distribute malware through a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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 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.
  • 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://soxebez.ru/award?keyword=kinds+of+chemical+bonds+study+guide+answer+key PDF link annotation
    • http://tepafuvofes.iblogger.org/58358340652.pdfIn PDF document text
    • https://ranoxezumurew.weebly.com/uploads/1/3/5/3/135345736/jelanovosivatiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/AyihqyJ/smashbox_primer_for_oily_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/m4gc5gc/41531295105.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/948821.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/1a0b293f563068.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/ridori.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/wobaxaxezo.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/nitidadufetenu/nokekelirob.pdfIn PDF document text
    • http://bujubigakokuv.epizy.com/tajegenajiforeguk.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/action_jackson_film_song.pdfIn PDF document text
    • http://koxowasone.epizy.com/free_accounting_journal_entry_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/cara_gta_v_di_ppsspp.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/what_is_an_example_of_disengagement_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/orange_crush_bike_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/65772688851.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/52895423310.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/system._windows._forms._notifyicon_not_working.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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 5804 bytes
SHA-256: 8935fd0040f1904bdc83c2376ad591ab36317e3882403292ab775cb631da502f
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10216 bytes
SHA-256: dbf953845ad36a5a9249c74de137846640360eb5f9ca0f861d1c07e5671c4a93

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