Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1538171fd66a0f2…

MALICIOUS

PDF

73.1 KB Created: 2021-02-14 01:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f63a30f397898955ad0bad5d833fe09 SHA-1: be41f01ed12cd68ac109edc069bf5c8befb32b82 SHA-256: c1538171fd66a0f2002ea176b063412959a031083dcbd00b880767df88028788
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious content, such as the 'itube apk downloaden' keyword suggests. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=itube+apk+downloaden
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6026eac678f31.pdf
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fe15f5b00772.pdf
    • http://activa-fb.com/lanuzimefwwj2.pdf
    • http://salonapp.xyz/496928133192xc3.pdf
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff28f0b3fc8c.pdf
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5ff302a977926.pdf
    • http://firstflirts.site/luxuwumevodew4zyg2.pdf
    • http://bupro.asia/455105758186jzkb.pdf
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5fca14ab7e16b.pdf
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc7d81f7c82a.pdf
    • https://static.s123-cdn-static.com/uploads/4495685/normal_60085af83987e.pdf
    • http://hangookoil.ru/arcgis_map_packagejhgvk.pdf
    • http://alternativeinfluencenetwork.net/ahsan_ul_hidaya_freez487x.pdf
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/jubuvezexesuje.pdf
    • http://begetus11ppz.xyz/55671375882kmgkd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megodipewukitoj/video_lagu_ainun_baju_baru.pdf
    • https://s3.amazonaws.com/kisagoz/chippewa_boots_sizing_guide.pdf
    • https://s3.amazonaws.com/zumomasugipeno/45583897740.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin
4591c1a34c7126dc18af803198b2683ef6b8da48acf6587b6981c6e5e84b8989
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 4912 bytes
font_01_sfnt_off0000f3f4.bin
22efa9685afb8e294458f759ec2983bc5cb3d6f211847a51bc7d36775de33144
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10364 bytes