Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d1bc9a1a091d5…

MALICIOUS

PDF

77.7 KB Created: 2021-04-23 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 458f6e3569e46751bff61bae265002f1 SHA-1: 483c035cf2c4ddd609bf5573e8fef0247b1a3edc SHA-256: 7a3d1bc9a1a091d535c36019ce57582c8368a316c354abe8e9baac2802d566da
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable or suspicious domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/strik?utm_term=client+services+manager+job+description+uk PDF link annotation
    • http://mihetos.xyz/607272668282sy16.pdfIn PDF document text
    • http://cheapkeys.site/ranozazatu7govj.pdfIn PDF document text
    • http://hotita.space/japanese_video_games_online_store25kq2.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/zojavotetagenivilopi.pdfIn PDF document text
    • http://oneitstore.pro/stuart_wilde_infinite_selfzhda0.pdfIn PDF document text
    • https://sisuwajad.weebly.com/uploads/1/3/0/8/130874073/6c994.pdfIn PDF document text
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/kepisujerulifaxege.pdfIn PDF document text
    • https://baluwakenina.weebly.com/uploads/1/3/1/4/131437578/7230796.pdfIn PDF document text
    • http://sefepov.22web.org/47385557649.pdfIn PDF document text
    • https://waxojokizubow.weebly.com/uploads/1/3/4/4/134482073/4fda800001.pdfIn PDF document text
    • http://vebumugaw.22web.org/gram_panchayat_work_report_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemakeruw.epizy.com/guidepost_tales_from_grace_chapel_inn.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/48265549722.pdfIn PDF document text
    • http://pexevogawi.epizy.com/does_dyson_have_a_reset_button.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/dipojutarat.pdfIn PDF document text
    • http://vuwozefadila.rf.gd/kezakutafibures.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_834738ea3137476d9bafa60197f097fa.pdf?index=trueIn PDF document text
    • http://xasebor.rf.gd/kepabomuxewafepujiwupid.pdfIn PDF document text
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_19bd5ba1859143fbb3ae00ce28087764.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/xumigusewusa.pdfIn PDF document text
    • http://fopaguduvogo.rf.gd/email_writing_template_ks2.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_73441d02fcce4914be2453fb35b58b8f.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_9bdd042a251547f3bdc3e3e0657cce83.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_c86dc51b4fff4fd685108d6f6999343e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kunewofi.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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 5640 bytes
SHA-256: f98ce6914502db181a8e23fc00c62b317733f1cdcd39b02a57b53ebc5fd10e18
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 10332 bytes
SHA-256: a5e8b51799cbb4a841810de694368ac851f94cd97282b391ef2027250fd7bcbf

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