Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc197d6cf00bc17…

MALICIOUS

PDF

92.1 KB Created: 2021-05-08 03:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a04f7e3ecd8fca160a7afb783ea4979 SHA-1: 7fac18988044834cccb6c394d159ba0163c9afc9 SHA-256: 8bc197d6cf00bc172a9df8e16bf8cbb3ea47358c85a2ceb9821d62a411a85c05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm designed to direct users to potentially malicious websites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically mentioning phishing and trojan characteristics. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=what+emotion+represents+orange PDF link annotation
    • https://lurovexizapup.weebly.com/uploads/1/3/4/4/134402553/vilas-ritakeduwivoj-jigudunepab-lopujuxakuziwe.pdfIn PDF document text
    • https://bovaxomasomi.weebly.com/uploads/1/3/1/4/131437143/jozabolikurafe.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/dimujuvuvegikajuz.pdfIn PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/2260497.pdfIn PDF document text
    • https://rekilobuviren.weebly.com/uploads/1/3/1/3/131380299/gepibafi_pojeka_jiwoluwojo.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/814.pdfIn PDF document text
    • https://vegerezunu.weebly.com/uploads/1/3/6/0/136053786/b2c6a9e.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/4aaba2.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/6ae85bcb8.pdfIn PDF document text
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/0457ef3983527.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/buxuxigozabatepi.pdfIn PDF document text
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/6158158.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/lepefi/crystal_reports_runtime_for_visual_studio_2012.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_eab05e651e8843808e8e021de3750c62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/online_photo_editing_in_jpg_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/android_version_8._0_oreo.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_6e6d1dfdaeb242b68a7814a40eff4941.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/les_ascomycetes.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/58367508342.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/scoliosis_exercise_program.pdfIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_52be8b8f92c349b18a0d141149e8cdc2.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_d2d207a69be04b27927fce678a84a208.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_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 5212 bytes
SHA-256: b79f46b66ceb54ccb73963b806fe68c0c6bb117787430823dcdab80fae8768b4
font_01_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 10672 bytes
SHA-256: a2369b0edeb7b73e9677ac3faed794db2d132ef353e812649f1a1cb82806df29

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