Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28f3c11c2dcf7b2…

MALICIOUS

PDF

71.3 KB Created: 2021-01-15 05:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2f9aa12a051b8f94861498ca9999474f SHA-1: 395bb9a47f9552f6182204e3d4fcd58a719d0156 SHA-256: a28f3c11c2dcf7b2cb7151b57a87926b83c155b2123ed33805613f84a750e6ed
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a critical heuristic identifying a mass external PDF link farm. The document body, though partially corrupted, suggests a lure related to 'super fund performance', which is likely a pretext to drive traffic to the listed URLs.

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 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=super+fund+performance+2008 PDF link annotation
    • https://cdn.sqhk.co/veleviziwew/hatgjVZ/97142264462.pdfIn PDF document text
    • https://site-1176306.mozfiles.com/files/1176306/android_studio_3_ndk_debug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fe6e91c472b2.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikifefisu/cjgAihd/gun_strike_shoot_killer_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/gibGwgi/sejokifoxav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f8b7965daaa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f9170829d5da.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/9943427.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jjjhejf/does_exocytosis_use_active_or_passive_transport.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_5fa7cd317240f.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/ihhjhpq/cut_the_cake_circle_game.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/libeganot/evanescence_fallen_album.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/50478750913.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/78187291121.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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 5664 bytes
SHA-256: 4de92c1455cf884326d789ef75ca19a1153d8bed42d18c9ba378ff0a75f898e0
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 11324 bytes
SHA-256: 3d6c733c382b2ebd60f46aaebb7a116a654dff102b966abe5ee93f6ba89c075b

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