Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acdf66fa47ea64c…

MALICIOUS

PDF

76.2 KB Created: 2021-05-25 15:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d71b350196dc0fa2766c1fb69cd3cdcd SHA-1: 60104cd709d02decbd08039af5eea7189604e942 SHA-256: 8acdf66fa47ea64ccffca7d7ec87f4510d9408f4d0762db0f1a782d2a55568ce
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. The embedded URL `https://botokaw.ru/strik?utm_term=isee+practice+test+varsity+tutors` is likely the primary destination for the phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=isee+practice+test+varsity+tutors PDF link annotation
    • https://vewejefimubi.weebly.com/uploads/1/3/4/1/134108794/vununubabale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde75f3da473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_60216665d0fc1.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/ce84228bfb34.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/ludezajipewob.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/lawijozuvapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_60679ff10b0bb.pdfIn PDF document text
    • https://xenewonunawof.weebly.com/uploads/1/3/2/7/132740417/b51b0e9d12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_5fe61ef823111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_6018517dbe6b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somisilegex/21409625217.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/vonoguvomosifedopavune.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/87250969646.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/bikini_body_pre_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/addyi_rems_program_patient-_provider_agreement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/alarm_clock_sound_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/how_to_clean_vacuum_filters.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/25509366616.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/bagejebapatubutarosebaxar.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/civ_5_babylon_science_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/potassium_chloride_in_5_dextrose_and_normal_saline_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/forged_carbon_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/is_lexington_law_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/thyroid_diet_plan_for_weight_loss.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 4992 bytes
SHA-256: 544c97bbed432439fad5313a20ed021effff739e562ea3d2e97381b204715754
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10700 bytes
SHA-256: 55dacfe7b6e6964e27c1d2005eaae4a96a1e8cc396cf4930290e47c6a28a4d40

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