Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4eaf55a801435c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-01 00:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d0ddae7dcc09c1cc22bbb8e6474b323 SHA-1: bbc308dc734b3bc61ddd9e9c9bb90f3c623635ca SHA-256: 8e4eaf55a801435c41fbc7de62cb90a22707f0a9cbfcbb529c715c072575db4d
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a prominent one pointing to 'resalured.ru/strik' under the guise of providing a 'free diablo 2 lod cd key'. This URL is flagged as a redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/strik?utm_term=free+diablo+2+lod+cd+key PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/dkigegg/cute_vrchat_anime_girl_avatars.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/e3e43bb82308009.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/bJQibie/muragubivewaxatezegafan.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/timozavowudelagedarewoz.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/att_digital_answering_system_dect_6.0_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/yLVjaKw/16203847837.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/hfH2ig4/kinesaza.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/rekarugekapoguxifojiwe.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/48978175493.pdfIn PDF document text
    • https://fowezojufogomod.weebly.com/uploads/1/3/5/3/135307270/51d2d5d.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/8222768.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/visagogijulep/how_to_install_a_bestway_above_ground_pool.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/92623276133.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/tcs_email_writing_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/best_marathi_kadambari_free.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/84378973134.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/explanation_text_template_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/skyworth_android_tv_review_philippines.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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5148 bytes
SHA-256: c16d1210b74497c9fd8263fc3850b3d19639d7d5e7d42ac7a66bc41758e9104c
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 10540 bytes
SHA-256: f6394bbeb2a0bfd32ae67bac195e7dfaca58d133f82b8c4323c770e4a8b52766

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