Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a9d9c7da9df339…

MALICIOUS

PDF

102.4 KB Created: 2021-04-14 15:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7fdded084ca2469f0d6da736acd06785 SHA-1: 27a77f05811124f53d7cd81194370bb99c8a02fb SHA-256: 28a9d9c7da9df339501ca90ac45e46488aa1f30f129fcdf3b92dbdfac55adec3
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 likely phishing-related. It contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript, though not fully analyzed here, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=braun+thermoscan+3020+manual PDF link annotation
    • https://cdn.sqhk.co/ramowejub/hdPPuje/nails_done_hair_done_everything_did_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/djbJlcj/download_factory_inc_mod_apk_unlimited_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/28idwNJ/81825420332.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/fec336ee11.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/3e1846029a20.pdfIn PDF document text
    • https://cdn.sqhk.co/mazasofuw/hdi8KYV/kujunisopunufe.pdfIn PDF document text
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/kimuv-dojipuforad-jatevevubemano.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/basic_electronics_short_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/Ldtja5C/pedaneva.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/waduzirader/reason_for_leaving_job_answer_on_application.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/25785971191.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/78016608278.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/fajulefajinaturinije.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_4fcc2281177b430d91cfafffbfc7ba18.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_6658769e4bdc47df914bee1cc3d84273.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/nitelimonerira.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/iphone_buttonless_ringtone.pdfIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_50bc6a1f0a8648fca4729dea755543a0.pdf?index=trueIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/bipavunudogarafuza.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/15045448691.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/twitter_cheat_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/is_taste_of_the_wild_dog_food_good_for_boxers.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_a9e99c5c3b124989aed1d1ae6b652a7a.pdf?index=trueIn 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_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 5528 bytes
SHA-256: 42be60d9414c96c14b75ead0d201f67571d1b875f7ea754a34bb42ed81283325
font_01_sfnt_off00015dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC6 15380 bytes
SHA-256: 80732b1913498a61f28ee3cff48cccf8e2633dda0eda0f0c276a27d36dce36c7

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