Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c6e7ead24b87b…

MALICIOUS

PDF

80.6 KB Created: 2021-04-07 01:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc7cda0eff9dc3fbfdfc2f9d71ae356c SHA-1: 207513db309ead0c71f4de724f2ab8683abe41cf SHA-256: 0b5c6e7ead24b87bf89c99f9d01e53ee509849b0c5f5e2a6f72f6ffc1c2ab46d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with a high ML classifier score and ClamAV detection. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=cp+chemistry+midterm+review+answers PDF link annotation
    • http://100naturals.fun/64613989337g6ouc.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/eijjiji/vilenuwebigi.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/3361072.pdfIn PDF document text
    • https://guvufusefek.weebly.com/uploads/1/3/1/0/131070011/rupagomebig_zeleli.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/fodexuvabet_wedatawitefajed_tibuvoga_zajowe.pdfIn PDF document text
    • http://banquepopulaire-fr.org/what_were_the_privileges_of_the_first_and_second_estateyld99.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/mjegcDT/moditeno.pdfIn PDF document text
    • http://womans30planet.com/psp_cso_games_under_100mb_downloade7u3n.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/nidaf.pdfIn PDF document text
    • https://duxupapumi.weebly.com/uploads/1/3/1/8/131856851/puriv.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/texozoxofaxisowog.pdfIn PDF document text
    • http://erogan-columbia.site/69832377622vg2hj.pdfIn PDF document text
    • https://cdn.sqhk.co/fifunolew/ARkhfcg/webibakeketupulejise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b596bb2-dd8a-4370-9e52-e1e88b2c62bf/65864677546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74174ae6-34d2-4699-8701-fcf526a02a07/what_is_the_official_six_sigma_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adec9e88-1dda-439a-8f3f-d9e5ed89bc1e/how_much_does_a_cessna_172_overhaul_cost.pdfIn PDF document text
    • http://gegenig.epizy.com/altronic_cpu_95.pdfIn PDF document text
    • http://tuxigufujera.rf.gd/understanding_computers_today_and_tomorrow_13th_edition.pdfIn PDF document text
    • http://roduzafudi.rf.gd/level_anticoncepcional_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64aeebae-f492-4d48-b1f5-9e97cc161f6c/75715907752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2862180-d64f-4048-9cbf-e935a318aa20/roxuvozekenunube.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 5440 bytes
SHA-256: c8565ba42b150018f71b84701ec5c17c2458226edd54dc03c804d478870796d5
font_02_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 11132 bytes
SHA-256: 218f420872f55d720bb883479cf6671734b1f4d306e1ec2effa437118654dbe5