Malicious PDF — malware analysis report

Static analysis result for SHA-256 9532e33278ebe4ce…

MALICIOUS

PDF

82.5 KB Created: 2021-05-16 18:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2f5727323c057811c2eb60fd9c1a8e18 SHA-1: c9b8cfcb4a56abe330d4c6a5d35409ee5de09bbd SHA-256: 9532e33278ebe4ce404693ce3d2afc9f7a0c8e9f7aa8a19a7879be4a7b23ace0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=collins+french+english+dictionary+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500417/normal_60342bbbebc00.pdfIn PDF document text
    • http://questotzvezd.space/venimisapilajepedpb83s.pdfIn PDF document text
    • http://nawumamarupojo.22web.org/london_red_bus_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffd4afe5c540.pdfIn PDF document text
    • http://balenagawovu.22web.org/dolepalapavage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_60433183d3b80.pdfIn PDF document text
    • http://legionmone.xyz/682870138536vvr6.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/ygfcibp/34942414178.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/ghEcEhf/69861230902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_6014ecd849ab7.pdfIn PDF document text
    • http://vigazorafoli.iblogger.org/padajoxalupuxazesaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_606e7a596a19f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fdfc92f7303a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_603446a232d52.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/cgfUG3S/youtube_lullabies_for_babies_to_fall_asleep.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/hcDhdjj/pibanorixozisonimika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_60001f3e200d2.pdfIn PDF document text
    • http://pay-order.info/tejusoganirigesomubsijjk.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/wikurixobelu/jaroxizidegepak.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/richard_clayderman_song_for_anna_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/contractions_worksheet_3rd_grade_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/attention_song_free_mp4.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_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 5492 bytes
SHA-256: 73291b95b4b5275b41b6cd752dcc9f283239f6b4cb0088e0e2f247404becd119
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 11636 bytes
SHA-256: 0ea8604ae0b569d91eaca3c148a161f87ea5b9bed2a23308d5327c67f94a597f

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