Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3168abfc3b3cfda…

MALICIOUS

PDF

68.7 KB Created: 2020-11-10 19:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f250935b53ca022b150ea9e59552c32f SHA-1: 85eda036889fa2f1bf04fa84db199ba6146fce59 SHA-256: a3168abfc3b3cfdaa829cc153f4d304a8c622afdf93dd302264406a2bf5b728c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/aws?keyword=neuron+worksheets+for+high+school+glial+cell PDF link annotation
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/3607761.pdfIn PDF document text
    • https://gupupekulumo.weebly.com/uploads/1/3/4/1/134108922/d8130ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8aa370edbee.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/zajusul_lemonoxowunab_vikosasoxekij.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/nibawobipaj_mixikaroxazir.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/mapuzuxeb_gunov_nijika_koxufuziv.pdfIn PDF document text
    • https://jigaxamika.weebly.com/uploads/1/3/4/6/134610035/7c7d1b.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/batipazug_vuzuminadoz_danobovafunoruv_kizakekurupu.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/4267459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5fa1ea773d29e.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/rimorebumew-togijesujoduj.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://s3.amazonaws.com/xamibudasagas/zagom.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/ark_survival_can_you_tame_alphas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b43d99-4eeb-411c-9b0f-8c2057e310e0/ge2524_multimeter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba59ff5-8ef3-4662-8ea6-5c904cf592a1/liste_des_verbes_faibles_en_allemand.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 5148 bytes
SHA-256: 7b187e9290f84f16bcc6817277ec3cc11497d324c67efa79dfa1b0f904be90a7
font_01_sfnt_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 10184 bytes
SHA-256: bb1a1c9505a2dd3474e9cf64b0898fad9c45818a43f502e0cf24ac64e6c348c7
font_02_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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