Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aa10c319380554…

MALICIOUS

PDF

71.2 KB Created: 2021-03-29 23:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ba18397f985eae34dd73d82862df086b SHA-1: 204990a67ccfd246faab19e1d2fa64279562dcff SHA-256: a9aa10c31938055485675bfdce80a14902cb287da4c7c803b352a9a7c57fcc88
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL identified as malicious and associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing lure.

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 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://pelibifir.ru/strik?utm_term=material+de+lectoescritura+para+segundo+grado PDF link annotation
    • http://geforiro.scienceontheweb.net/panzerblitz_counters.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/72072210907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_66860109dcde44fca8944833518ce6d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/evenflo_stroller_wagon_gypsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6f42a4-705a-4015-a3b0-9c1a1898e109/70483889794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666568c0-a416-4ffb-b6a6-2c4d0565a8aa/figurative_language_in_the_giver_chapter_5.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_18ab5c6811bd41f6862b5bebdbd20b66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/conductas_sexuales_anormales.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/uc_browser_hd_free_apk.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_b235248b37f54f8284376fa9f3ecfe8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/53297824510.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/38978555260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8473cf-697d-4b02-aabd-e1f19e36cd00/powidifevi.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/movies_available_for_on_xfinity.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/23102948793.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/zijefewakaxavufunegebowa.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_62dd844fa30c4fcbb48eecef3a7bbaf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/aristofanes_lisstrata.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/literature_and_the_writing_process_11th_edition.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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 5248 bytes
SHA-256: b2c973d5136d68024070374ef133d7d67aa6d7d6863fe0e86ffd9fb6c3bd9e22
font_01_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 11492 bytes
SHA-256: 2e90ebb0caf2bda7cea1d98a3ba5598162c622b8b56447724fa3c67a51194631

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