Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8a5fe13eff097c…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 02:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9893cfb2c469092344d427709cfa002a SHA-1: ed167d51c8a5df848fc1ce31ed3ae12f636affb0 SHA-256: 4a8a5fe13eff097c54fbd9b2ca56f67ff66c0634736b3043ade3fd291fe395ca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to documents with seemingly unrelated titles, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/award?keyword=business+development+case+study+pdf PDF link annotation
    • https://cdn.sqhk.co/mebereserab/fhhL6SD/neuron_model_with_household_items.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/sports_vocabulary_list.pdfIn PDF document text
    • http://guronid.mygamesonline.org/pathophysiology_of_typhoid_fever.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/Pmiw1jd/police_chase_houston_october_2020.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/foniwefusi_fekefunet_viwemafafogona_moxuleb.pdfIn PDF document text
    • https://cdn.sqhk.co/sokogiki/iWihngd/cara_arduino._cc.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/6adb3fca.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/099e248d.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/6119949100.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/ggggjhi/dead_cells_throne_room_boomerang.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/eHQjggf/dallas_texas_gang_tattoos.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/wineluxa.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/lobiraribixefe.pdfIn PDF document text
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/xevuzut-fibologen-kevoxumebuzolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fizup/azar_app_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/do_impact_phials_crit.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/marathi_actress_photos.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/batman_killing_joke_4k_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/how_to_remove_an_adt_system.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/mechanical_vibrations_rao_5th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/follow_us_on_social_media_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/bone_forming_base.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/jumpoff_jo_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/what_did_plebeians_do_in_ancient_rome.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/how_do_keloids_form_on_your_ear.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5296 bytes
SHA-256: c6513107cfee831c1d8294b7c4f4b98010528755aec837ef86e4d0dbd0eb6ba8
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10252 bytes
SHA-256: c312426bbb4451247678c8987f5f8d6a9d172959a762528e181cdcdf18d7c3b8
font_02_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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