Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd496efa8f0404f…

MALICIOUS

PDF

87.3 KB Created: 2021-03-22 17:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a1c3da29b24399bfe45aa0fce4425200 SHA-1: 5bb3570a3a02cd4d8d1cbe56795a7865818a1423 SHA-256: 6cd496efa8f0404fd52431f58a655b76ba66662e24f8110cbb19a3637fed0079
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The presence of external links points to an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=why+we+crave+horror+movies+city+of+publication PDF link annotation
    • http://ukranews.site/bupupikonisozowhsasr.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/75230852309.pdfIn PDF document text
    • http://buloshnaya.site/61703533812dvffl.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/angle_bisectors_of_a_triangle.pdfIn PDF document text
    • http://wordsideget.top/zozomibufuvudonoz1o98n.pdfIn PDF document text
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/1462889.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/lisatiperinomakude.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/ad398bf.pdfIn PDF document text
    • http://0fruit.space/9_snf_fizik_kuvvet_ve_hareket_konue73sh.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/meaning_of_the_phrase_in_a_split_second.pdfIn PDF document text
    • http://help-business-media.com/wanepqoptk.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/purufiz/bootstrap_4_login_form_center_page.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/christmas_gift_guide_for_him_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/13611848714.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/78702376731.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/microscope_rpg_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/baldi_s_basics_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/lojelitomimixupifiwipuso.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/kolotabitaxoko.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/15108394026.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/velocity_and_acceleration_practice_problems_worksheet_answers.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_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 5660 bytes
SHA-256: 491e90029bd87bda62002ae8089e563359b03d628c9915f7f76c4d48889c6b0d
font_01_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 11120 bytes
SHA-256: fdb0918de8e2bbbe0c904117980f230931f18744e9a1d01fce4a3907ab2c268a

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