Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ff203555abbcb8…

MALICIOUS

PDF

85.9 KB Created: 2021-01-21 09:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7eeee16cc703b4fd433e4327ac27cb6a SHA-1: 9a683f15cd11204a72eeca696e0b4f8e354e265f SHA-256: b8ff203555abbcb84fa7d7fdd6fb9a62b89bcfeefd01b143fe6d45ce93a763f4
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it is a redirector and a link farm. The embedded URLs point to known malicious infrastructure and disposable hosting, suggesting an attempt to distribute malware or phish for information. The document body, though heavily obfuscated, contains references to 'pandora black apk free download', reinforcing the lure of downloading software.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=pandora+black+apk+free+download In PDF document text
    • https://bukalejobiwasek.weebly.com/uploads/1/3/1/4/131409200/mumuzus-nikikuz-lodarijikudag.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/gujos-sisolasaguzeduf-gigumorilarag-gitibakex.pdfIn PDF document text
    • https://buwavazazaradig.weebly.com/uploads/1/3/3/9/133999961/1284804.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/6224311.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/zjghfzB/wevojupebok.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/sirexirivi.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/2099181.pdfIn PDF document text
    • https://dadazifetulo.weebly.com/uploads/1/3/0/9/130969312/1932348.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/e032139266602f6.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/goneduzum/78704402143.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/basic_geometry_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/dobimukefegowiwuduk.pdfIn PDF document text
    • http://biguvuxurezuto.epizy.com/pebonosotavijijibexus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5268 bytes
SHA-256: 9a70996bb8e6baa5118431a5a8e1ba263c8350d8319640cab9640be95b0da5e8
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 11600 bytes
SHA-256: f0396875d1e58d94fa90f799e9a3cac799d07abfea03ed52a3946d42350349c0
font_03_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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