Malicious PDF — malware analysis report

Static analysis result for SHA-256 181ce5f422a5c9b6…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 11:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 799d94d2c024a9e64e87dffd6d772f28 SHA-1: e2b11cdb4a98a74ca377e9660328556cd964a1c3 SHA-256: 181ce5f422a5c9b68e431d7a6c1b60391e13a3047f41cdd8cd018b8bad25ff99
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded URLs. One URL, 'https://druttle.ru/award?keyword=logical+reasoning+questions+and+answers+pdf+for+class+2', is directly associated with a heuristic indicating a link farm on disposable hosting, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to 'logical reasoning questions', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://druttle.ru/award?keyword=logical+reasoning+questions+and+answers+pdf+for+class+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494165/normal_6055787a1619b.pdfIn PDF document text
    • http://e-devletodeme.net/does_medicare_supplement_cover_preventive_caredao4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_602510ae5bdcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_604d3dccacf1a.pdfIn PDF document text
    • http://hamlikjorettoop.ru/50330170617xdesw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_604ca5651615d.pdfIn PDF document text
    • http://carinsusa.com/966911634763taix.pdfIn PDF document text
    • http://kfcrabota.ru/89652465728absl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_603784750cc39.pdfIn PDF document text
    • http://tublitalia.fun/17355033364tb13t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7277cab5-ca8e-4442-a43b-e7a6659c98b6/fitbit_versa_lite_not_showing_texts.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/chakra_balancing_anodea_judith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c19a56d-333b-4fb2-877c-1044b7c2733b/85380637307.pdfIn PDF document text
    • http://rupawuvafe.rf.gd/giburejuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5dfc173-050d-4005-a5b3-a6a3623ce308/the_water_knife_free.pdfIn PDF document text
    • http://jiporiri.rf.gd/annabel_lee_test.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/vodunemezema.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/bowelutexabe.pdfIn PDF document text
    • http://bosirizowu.rf.gd/list_of_electrical_engineering_colleges_in_mumbai.pdfIn PDF document text
    • http://winovewivigo.rf.gd/mavawagakakibunitekoxix.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/gizatowelupajorigumimebod.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/54919201577.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_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 5616 bytes
SHA-256: a90308e475b1e088286e26fa557bf164497e8d2f222348d2c2bf9822a90dd7e9
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10672 bytes
SHA-256: 4675a45e0e1de30c4de2a2cac7704ad81ea195f52baba9858efc905f97697718

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