Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1bb3d7539631d3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-10 23:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adb6c7935dfc9c23436286f559401cd9 SHA-1: aedc6e524e49b3f8ffe006b0bc3049bfa117d4cc SHA-256: 1a1bb3d7539631d3218905f72daac869593414beb289a457a40385fdb34f17d4
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The SE_ADVANCE_FEE_SCAM_LURE heuristic suggests the document's content is designed to trick users into a scam. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure disguised as a nursery rhymes PDF, leading to a scam or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://yafferge.ru/123?utm_term=tagalog+nursery+rhymes+lyrics+pdf
    • https://cdn.sqhk.co/lixozimiz/T0NOMF4/dekudizidopefa.pdf
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/6ba332f1b.pdf
    • https://cdn.sqhk.co/kuvuwisarov/Jvqgfhf/13709164496.pdf
    • https://cdn-cms.f-static.net/uploads/4393751/normal_6018ee598d9d9.pdf
    • http://francobusiness.com/6298202347bvxsm.pdf
    • https://xinemituvirow.weebly.com/uploads/1/3/4/1/134108685/3515433.pdf
    • http://leomannapov.com/433310842453xt6x.pdf
    • https://cdn.sqhk.co/fiduzosi/drPugji/emergency_alert_app_canada.pdf
    • https://cdn-cms.f-static.net/uploads/4476924/normal_60256c1074a75.pdf
    • http://reduslim-siteofficial.site/sony_bravia_tv_remote_app_for_androidemrad.pdf
    • https://cdn.sqhk.co/zoribakim/he0YVVP/shogun_shreveport_menu_prices.pdf
    • http://recepty-dd.info/negejuzuvibasixuojmh.pdf
    • http://stassikorskyi.com/77609879430set7c.pdf
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/2864349.pdf
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5fe0fd2e75db0.pdf
    • https://cdn.sqhk.co/zewezerezi/gghhijg/esdiac_international_calling_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4462694/normal_601015421948c.pdf
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/8716b8ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_8485b3318b804d26948d04ca5bf3c512.pdf?index=true
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_9443a1c29ade465ab476c7c710e31025.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_1ae10c5130ed43ae95992ae4b68a98a7.pdf?index=true
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_81c08b0f4bb5474fbca8fb3674819755.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_a92469d0db544b83aaa98d17b142e6aa.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e0.bin
7fd06b6bc567029e86ac96952d661b655481c5ba3e7c7dd18fd383f4f9e4a45a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 5620 bytes
font_01_sfnt_off000106db.bin
11b321267922575f5a86f5188ff8e5813c24ec7eedc9a8e776e37df083f28601
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10300 bytes
font_02_sfnt_off00012a6e.bin
0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 16028 bytes