Malicious PDF — malware analysis report

Static analysis result for SHA-256 8444b6c097760bf0…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 22:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aa8d2fdb34afdfdc39dcf5d60a3b210 SHA-1: dded10217adc4ccc303a24fce6cc555ed997e506 SHA-256: 8444b6c097760bf0c180a901089a1cf9f98cfdf6ddb25911194a78d3b206967b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to unknown domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=rules+of+backing+up+a+car
    • http://lifegirls.site/bipegovilodqzvpc.pdf
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/30a7b9186f5a90e.pdf
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/jidipozimamenolu.pdf
    • http://train-home.ru/25502124913ju6ph.pdf
    • http://liwurivosopap.medianewsonline.com/degradacion_del_plastico.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/sasujofiwuduroles.pdf
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/zilusese-tisuvumavotowo.pdf
    • http://asta-stroy.ru/what_cases_fit_samsung_a10er8lp1.pdf
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/sunurofejo_fuzovekofelej_jelewuk_nekipuvatos.pdf
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/3680532.pdf
    • https://pedodexojur.weebly.com/uploads/1/3/0/7/130775447/kukavevo.pdf
    • http://robugipunebib.mygamesonline.org/descargar_discografia_los_tucanes_de_tijuana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/how_to_reduce_echo_in_audacity.pdf
    • https://s3.amazonaws.com/gogonof/50752994008.pdf
    • https://s3.amazonaws.com/xufaxoferugod/59251895473.pdf
    • https://s3.amazonaws.com/jolozidabi/32115782011.pdf
    • https://s3.amazonaws.com/tisegovofu/50_advance_payment_request_letter_format.pdf
    • https://s3.amazonaws.com/pujirageg/bixanotawojejikis.pdf
    • https://s3.amazonaws.com/dazovosugev/kumano_kodo_hiking_guide.pdf
    • https://s3.amazonaws.com/pusolefosex/brawl_stars_hack_no_app.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_off0000df92.bin
7359e5ac578b475d2d475a05b2473aa54f704b37cf6f16004175b8aac8ed4e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5396 bytes
font_01_sfnt_off0000f204.bin
0a26d75bf02a55c053db92f340001c85ba24a7a8673e40effb8f80cef075773c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10772 bytes

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