Malicious PDF — malware analysis report

Static analysis result for SHA-256 70de0fe24cb0bfb5…

MALICIOUS

PDF

89.4 KB Created: 2021-03-12 20:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a227361a37cb840d51fc7efc793bb964 SHA-1: 044a3618199ac24911f503aa066a87f07bba6baa SHA-256: 70de0fe24cb0bfb5a4b91b69c9f2e7c1b5f93952c965a50a679b14d30830172e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a question that likely serves as a lure to encourage interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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://nipisod.ru/strik?utm_term=is+the+roomba+880+wifi+enabled PDF link annotation
    • http://idslim-italia.site/bugera_v22_infinium_guitar_combocwcyi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/jdgjpge/kafugo.pdfIn PDF document text
    • http://jopkapopka.online/beragip84ob.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/ajgifji/digi_online_login.pdfIn PDF document text
    • http://znasila.ru/boom_beach_hack_version_for_android64ih6.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/ijfgh32/41321594637.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/ecgeUbd/hide_n_seek_biscuit_recipe.pdfIn PDF document text
    • http://salonly.xyz/gomexifegebanexevalaxobq9ndd.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/annotate_free_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/IhhbEii/racing_game_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/ZdgeEev/tv_guide_turner_classic_movies.pdfIn PDF document text
    • http://setopin.mypressonline.com/42692889407.pdfIn PDF document text
    • http://teaitalis.space/152754196682zw1h.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/tubajazipepovudepamafutu.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/ibUVHBp/emergency_buzzer_for_elderly_for_sale.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/xifufadi.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/ifwsjcK/gidalofagovepanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3f328c-1f04-402f-8494-3dd157d1e60a/leperuvimotevasowepuvomef.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/28411302903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68b840c-a78a-4e2c-970f-f1ebd54f5785/1756789526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d749ad-86d1-4ab7-b3f0-4a7beb734886/3387237319.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/juxidomoziginiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/wixuzuzodoxikuvedupedunog.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/faxaxepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c708eef-7b2d-4310-a92a-c598b3fd44d9/disney_old_yeller_dog_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38947ce1-79ea-47f0-9de8-618b8877ddd1/7621566151.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/wizard_and_warriors_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/nasijepobasorulevasoripej.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_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 5652 bytes
SHA-256: a09d4430a32513b1da72f2903f0a58944cbaf347229b023c9dbd690f96b1cdc8
font_01_sfnt_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 10616 bytes
SHA-256: 4884aa9bf24bac6760368d2106def5db503d14afd62ea2a209078fc58fa86f50