Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43ab813dfc4d48d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-29 18:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 89473238ef9571a95b9d46a270760eff SHA-1: 9b0afa2cd7fdbe6f602b2872330d336f262dcaff SHA-256: f43ab813dfc4d48d0e9c31a61e98c64443710a57147fefa6538c3bbc884a6ef7
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 0.9993

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://crophysi.ru/aws?utm_term=how+to+do+vinyl+labels PDF link annotation
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/5968709.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/xikazozebukipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022c9f19fbe5.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/170856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fe12982c6156.pdfIn PDF document text
    • http://pululap.22web.org/android_10_gestures_nova_launcher.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5fddb23668498.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/taxiduretuwerux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_604e26724a61e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetevatakipip.epizy.com/fomiper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a313779-b533-40de-9bdc-7451925ce386/the_republic_of_sarah_cw_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925db111-b328-4c67-b128-ab75422dc4ed/98407150493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1be42e5-0a39-4679-8421-6e578d53c8b1/midoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c400120-bed8-4994-87c1-d2bd129bc407/how_to_write_a_running_record_observation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9732b6ee-b9d4-49f5-8a2a-6c3b3e64f953/19007620069.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_8ce34eef8297412298ecbe44b595e306.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8ac835-a465-4335-85db-38d6fa689d22/19368002313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f86ac94-a1e2-4d2d-a615-007152fffbad/80714158405.pdfIn PDF document text
    • http://mogewatiside.epizy.com/42627366163.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_a95cf1a4ce9a47a1a03a06afe346165f.pdf?index=trueIn PDF document text
    • http://tipujujidudig.rf.gd/fios_replace_remote_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d5684d-20b1-4357-85c6-76fedbdc13b9/vodepabagopit.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_62d12289cc43481f937bb38dfc75aa35.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 5080 bytes
SHA-256: a6e10b6c3d4eeb50adc2f7bb178a2f0c8d7070aaf0aa3775d29830c69d4b15cb
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 11772 bytes
SHA-256: 9d9b2d8a31ae7424118569e1e3b05bfe1ab7005cef8638ee6b574f5bd562af93