Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b637ebefbbb5cf5…

MALICIOUS

PDF

86.2 KB Created: 2021-03-28 17:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d807c04b02149dd85c222d77bd76ca18 SHA-1: 037d98ca9b15ab7dd4e730dc5b35ba6b40a739a3 SHA-256: 1b637ebefbbb5cf55883a7ea71c2c4b44e0554f92fad01436c5f88787fff1aef
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to obscure malicious destinations. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=how+to+use+google+to+search+with+a+picture, which is likely used to redirect users to a phishing or malware-hosting site.

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://jottigo.ru/strik?utm_term=how+to+use+google+to+search+with+a+picture PDF link annotation
    • http://lnstagramcopyrigtservice.com/karma_khushwant_singhl6m1m.pdfIn PDF document text
    • http://beautysale.site/how_do_you_quote_the_bible_in_mla_formatgff5g.pdfIn PDF document text
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/mudoxusuxeva-nikumixine-zezozekuzol.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/vividibapezuxa.pdfIn PDF document text
    • https://xujuladobagaju.weebly.com/uploads/1/3/1/4/131437733/mabogofulage.pdfIn PDF document text
    • http://creamwalls.space/asymmetric_information_in_health_caregexse.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/dawefasi-pokepirob.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/nalivugegunozesu.pdfIn PDF document text
    • http://pofubodegi.iblogger.org/58725226276.pdfIn PDF document text
    • http://canonsburglake.org/415006881670zv97.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://vejegaba.atwebpages.com/gurilel.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/46826164609.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/kopirewol.pdfIn PDF document text
    • http://jafojib.rf.gd/12514857752.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/21543979405.pdfIn PDF document text
    • http://bezafesu.rf.gd/employment_bank_annexure_1_form.pdfIn PDF document text
    • http://kepijemimubu.rf.gd/lasetitaxikire.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
    • 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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5024 bytes
SHA-256: c2fa2605d6015543a63b6144ad08a4beb0fee34cdbb0e540d87da068f349afb9
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 11212 bytes
SHA-256: aa4ac8eb8e3c7b2beefbfedd2c5d8e2b63598ea883430576a1637aab010d990d
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16240 bytes
SHA-256: 72456a6d6cd95ebc08379530a2cb9f29d8ba054b28fdc78b9142b5572a46dd1a
font_03_sfnt_off00013b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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