Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf35f7a916860d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-10 08:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbf0611d4c298d3841ae9a71040a8de9 SHA-1: 56faf737c9a2b39793843fb5f6120ef650075af4 SHA-256: 5caf35f7a916860d088f88df01b5042058cdf8fc3affda3b1287b5c5cf537d25
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/aws?utm_term=raymond+queneau+exercices+de+style+gastronomique PDF link annotation
    • https://zadisoro.weebly.com/uploads/1/3/4/5/134525292/kurija.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/zepafufatidowumokedife.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fd06530f0904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_600d1b41aa7cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_6039f9f0ea7d4.pdfIn PDF document text
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/gebenisiwoxezapazev.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/radakizojemixa.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/vudavokonupelarifugixuj.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/kigoboxavuvuduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_60315fab53134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_a330a23722a3458899697b132ad25c42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/best_compact_washer_and_dryer_uk.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_65a527d985894ffbaccb7fb863aefc38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/13534981509.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/4th_grade_division_problems_with_answers.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_f1a3a2ed99764aea932c8595058c9106.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/92743347598.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/ap_agriculture_budget_2019.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_2ccad1cda9854d7885c024413cfc63b3.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_5d6fda004ac34814825152d807ddd5e3.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_e658339968e84f6da65c4fc5472736a7.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_8857277e202949fba53ff26a262cb3d3.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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 5560 bytes
SHA-256: 97e2a82a17741115abef075f527344241c49bc3de3dee91a2f83ca0f1aef09ec
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 12388 bytes
SHA-256: 9fca945c6da9ae5ae5564783543914ce2aade6ca2a5931bfec3f7d9d8003171b