Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd5b76550f6b11a…

MALICIOUS

PDF

75.8 KB Created: 2020-12-26 20:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e6d8427e3909fa5071ce649f09026907 SHA-1: 9783b80d1b1cd44fc613e7aefa5dba90eaba78f4 SHA-256: 7dd5b76550f6b11a055e1fcb0b6d906c12a1afaf471996aeb59ae507ccf9663e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL that redirects to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=cute+wallpapers+vsco+pink PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fa165af79d02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fc87a8fb4195.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/b956a3.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/493425.pdfIn PDF document text
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/5124930.pdfIn PDF document text
    • https://loxojewumiv.weebly.com/uploads/1/3/4/6/134651611/jemijiwamur-vogam.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/0adbfb26-60cf-4aa1-9949-a72df903d4bb/57770191966.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/what_is_a_healthy_lifestyle_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/fuwisogosefowisajafinisuk.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/383477062.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/84093182531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c2456a-94dc-48d2-8876-02ae538d6c27/adele_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9badb4-f828-4dfc-9127-925efdca4ce4/10864369741.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 5048 bytes
SHA-256: 7b41ba9d4d34de5b0c7fc1e19c8d604fbb4262c6eaa754607000b12fdf0ab33f
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 11496 bytes
SHA-256: 0eba869bad634355a9ee097fd04a3962000358df8692d5bf4a359c78b488f8a6
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 17796 bytes
SHA-256: 89dcc0256771fcc3ff24ed8ce7091e643d253b4896fbf4288d4d65609a8e346f

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