Malicious PDF — malware analysis report

Static analysis result for SHA-256 102a5b1f30fc500c…

MALICIOUS

PDF

59.3 KB Created: 2020-12-15 03:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2c33f730131c70d4fb72fa21bf88249d SHA-1: 131c6ca74cadfa3bee1b94187c115cf714dd0b4e SHA-256: 102a5b1f30fc500c6db8324ba6da4a60a9d6c571fcfbc7f47cba02f588161e63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm or phishing operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=auxiliary+verb+worksheet+grade+4 PDF link annotation
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/ketajijinixu-luraje-xajiwo-bonemewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f89a42677358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5f91bc189f614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_5fad999f66f4e.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/lekaromupulelil.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/tasufagijaremo/wufalegalubabefop.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/xasererumegaralubepinexaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc532e34347c7043ce2c/t/5fc13cbccb3e0f57717c8ef1/1606499517426/dizaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/totumokivigiwifatevabotax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d2d218-0bd9-48e5-b8f1-a2e1ebc3abcb/86021341545.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/healing_back_pain_sarno.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc112aed26ff1194f74a888/t/5fc3a4893485235c86366840/1606657162653/86106529883.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_off0000ab84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB84 5692 bytes
SHA-256: d7fa0f8c966358a1c8f2626782cb6df1df0f6fc6ea8010ae9ff1b8d372e30b12
font_01_sfnt_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 9816 bytes
SHA-256: dd3a8914e88c09d950cb25f95b38faa571f071e5df1528135338e80af89694b7

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