Malicious PDF — malware analysis report

Static analysis result for SHA-256 109f01fdfe97065f…

MALICIOUS

PDF

71.7 KB Created: 2021-04-06 11:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc7c0be6555443954c533d21d22d411 SHA-1: b60ad16c1c446393356b63f6eff19f06eac33b50 SHA-256: 109f01fdfe97065f64cd73fdee994de51f1380fa317be6756a0531b9afa0bf75
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL analysis suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+makes+a+dark+story
    • http://bettyloustintruckbbq.com/38869529310v21tu.pdf
    • http://dusosax.66ghz.com/88387310578.pdf
    • http://buyfastedcircle.xyz/magicseaweed_strandhill_reporth5yan.pdf
    • http://yachts-4-sale.com/daximimajeloreredogitds1aj.pdf
    • http://dayzcommunity.info/sezedozuzetevamelxqfr.pdf
    • http://svarka-aurora.online/2018_vw_tiguan_maintenance_schedule_canadalbq82.pdf
    • http://useplafond.xyz/libros_de_economia_politica_para_secundariafctci.pdf
    • http://idealslim-italiaofficial.site/warframe_unvaulted_primes9ivhv.pdf
    • http://jewagep.22web.org/rapiwowigivi.pdf
    • http://frasqen.online/kawasivijoc3ka5.pdf
    • http://disconto50.info/what_is_the_purpose_of_scientific_argumentation_brainlyr93ks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zalezir.epizy.com/91357723313.pdf
    • https://uploads.strikinglycdn.com/files/e99751d0-ea36-4684-a712-2d192b444dfa/82321860049.pdf
    • https://s3.amazonaws.com/rewepalazamiso/marvel_movies_in_order_2020.pdf
    • http://totefejat.epizy.com/vuduv.pdf
    • https://s3.amazonaws.com/nedijowewoded/60015101711.pdf
    • http://diwevobu.rf.gd/59985670628.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_off0000dc78.bin
4387e9baf1b532924f7744c2f93db67eb817fd3fe80c38fd774eda8f93ec7446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 5212 bytes
font_01_sfnt_off0000ee12.bin
e3f8b4fd4a6dacb6eb10f228f04e6badffcbdc8883272dab8a19ae29d44cba0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10508 bytes

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