Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbf1429aa7f46b5…

MALICIOUS

PDF

94.3 KB Created: 2021-03-30 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e4b5ddce2656bfefa98a44fd94d807f SHA-1: 59d72d38515849557a9efb09bda88eab22ea731a SHA-256: 3bbf1429aa7f46b5669f0a36f5dcb22a4c18a4220f5b18cf7131664200527208
186 Risk Score

Malware Insights

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

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 6

  • 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.
  • 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=homer%2527s+iliad+book+1 PDF link annotation
    • https://cdn.sqhk.co/jezumasulej/ggdhehi/teacher_funny_quotes_in_urdu.pdfIn PDF document text
    • http://creditinquiry.info/4640646596l6qti.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/fa9eb.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/bezanetose_nusovupelajowup.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/mifrooc/11325641358.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/ijdRSjh/tosakav.pdfIn PDF document text
    • http://autokenn.com/zefekelasinasekirabomibbolb.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gcbhjgf/amazon_prime_music_download.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/gafowepunivifa_sixonided_piwimedidotezu.pdfIn PDF document text
    • http://hiziryigit.online/how_to_cook_a_pernil_puerto_rican_stylegmvzz.pdfIn PDF document text
    • https://jitolabifu.weebly.com/uploads/1/3/1/6/131607188/tinilakipaka-sedasitugojomud.pdfIn PDF document text
    • http://pavelaxokegamud.22web.org/us_military_alphabet_code.pdfIn PDF document text
    • http://honey-love.ru/joyce_araby_short_storyfqc9q.pdfIn PDF document text
    • http://esportzmlevent.com/bogujirilovadula96j.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/nivivif_xaxuvatojojube.pdfIn PDF document text
    • http://kafojiv.iblogger.org/74341711572.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://vusizudufekope.epizy.com/carel_pco_default_password.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_31b67c4eb78b46cb950bd665f38fe496.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_7150eaf9457f4bf399449c599a7e174d.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_2d1b77769f6442d083d9f655887f64fa.pdf?index=trueIn 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_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 4824 bytes
SHA-256: 160e77f8adfa461a91e28c8cdb4d67674c3bed6e78c9b6886da1c592655904be
font_01_sfnt_off00013a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 10468 bytes
SHA-256: b3d0a2ef8ae4552d40b7215570e7bd0fb4d70bfb0525591ca218bdad052d46aa
font_02_sfnt_off00015e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e