Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a3c42beb0b9793…

MALICIOUS

PDF

85.9 KB Created: 2021-03-09 19:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b40c06d08f41fb3d8458ede421c1363e SHA-1: e1e9aba285a2485b1d15ea4232940b9c51807753 SHA-256: a4a3c42beb0b97930f6313d941d302975baddfeb932789b03ffbd644e9c3c029
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload or visiting a phishing site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/aws?utm_term=amsco+apush+2015+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xekejegixawo/hiHjfbj/xmeye_app_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/72ighj4/gesebexafosudeju.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/iiOZHge/animal_cat_ringtone_download.pdfIn PDF document text
    • http://finutepanaj.iblogger.org/frigidaire_50_pint_dehumidifier_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/2jhjdgi/twitter_clear_login_notifications.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/a94b314f-73aa-4576-ac2e-64977043a66f/integral_calculus_meaning_in_tamil.pdfIn PDF document text
    • http://xixepobubin.epizy.com/27602473301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a75a120-57a0-42fd-8710-788f66751bc3/befisebesin.pdfIn PDF document text
    • http://jirulesonena.rf.gd/namugowunezok.pdfIn PDF document text
    • http://wogomud.epizy.com/sandisk_clip_sport_firmware_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b49a42-6f61-4c0d-9eea-36bcda986030/9892165814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97d4019-b22a-47af-a1de-24395aa0dbf4/38947540234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c997c3-0319-4d6a-b3a9-fee157af73cc/plc_programming_training_center_in_chennai.pdfIn PDF document text
    • http://lujufidopugola.rf.gd/budokugowufotifibiwari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a71c65-fb1b-4de9-8a0e-e40142fe2f9e/42811352871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc60212-88b9-4cc1-9d24-9cd78edb1e8f/lexokabimezuvijorofav.pdfIn PDF document text
    • http://jevusavisa.epizy.com/asos_buty_na_platformie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c52baa1-8d01-45f5-a4d0-909429112dd8/67250680905.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/baxufibovijuwibiked.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/43310985996.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/vofeniwiniwow.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_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 5832 bytes
SHA-256: 2be72bd3f8c9a03ed382e66a7fe6ca84759aa109db87d633e22f64af8f712af0
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16600 bytes
SHA-256: 9c5042a75cb49d6caee3b4fcdb7b3115ebf10aa947a74b5aebaf3bdb5b93ee44

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