Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8e55b21dd58f79…

MALICIOUS

PDF

82.9 KB Created: 2021-03-18 14:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30bfba81da65b0a67125655748456ee3 SHA-1: 9d3351fe2e91abd354dd971a2ff6bfc9beb4d12f SHA-256: 2a8e55b21dd58f7968a88b436d52415d1de2f1dac8889a6bde98bd4f4c1593da
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 0.9989

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://lozipotod.ru/123?utm_term=evaluation+formative+sommative+et+certificative PDF link annotation
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/fufufiwazafu-mubosakid.pdfIn PDF document text
    • http://wesifugutedif.iblogger.org/how_to_clean_automatic_soap_dispenser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_601abb1cbc114.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/gurafiwet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6037d612a5543.pdfIn PDF document text
    • http://wonamesavap.iblogger.org/xufazavewusuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_6041ffa0da603.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/3a73eb964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6018e0451fa4d.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/bulufebotije_kotabedojunixes_fonodoki.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/maxibegototoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_604de0f21bdbb.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
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_9c9e8f1545d14c9a9fc13a98e29e2ed5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/66349934540.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/82688192104.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/ribefugozov.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_27006e32b3cb4645b657efdf505459a8.pdf?index=trueIn PDF document text
    • http://nexuxawire.epizy.com/which_of_the_five_marketing_management_concepts_best_applies_to_jetblue.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_fc8a566ae3eb496bb1610c5058205ab8.pdf?index=trueIn PDF document text
    • http://koroputonazan.rf.gd/gelozubotupoled.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/is_usps_open_on_saturdays.pdfIn PDF document text
    • http://lovenewaw.rf.gd/kusorovekilobagobofin.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_b6cac3c7b35540478f04e86e49951f48.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_5a130daf8f594ecab676786955db0686.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_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 4924 bytes
SHA-256: ee9104567c2873f35c39f59317d5236a198d1d995d1b343ebfe11c153a9561ba
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 12576 bytes
SHA-256: 207b665459151e8f40cc717872772cb3ce50eb5db56de9947131eebd64fd1200
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378