Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b163123152dd773…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 09:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a70fd531508455aaafe8a31e569c927 SHA-1: d773cb9835add46e0de2bbdf7e31cfc9652b6b9b SHA-256: 3b163123152dd773d2946f34fbc671f1dc40787b491eac9329b0b8a73639ae16
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=maplestory+m+bishop+zakum+guide PDF link annotation
    • http://spainsale.pro/20068323948t2e7c.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/rotamesiz_ragun_pilugidiro_silor.pdfIn PDF document text
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/famolufadosanilodufe.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/wjjgGeH/ich_harmonised_guideline_for_elemental_impurities.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/wetivad.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/kJDhjQu/27005734969.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ieLJMib/slytherin_robe_and_tie_cheap.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/68544134694vuj53.pdfIn PDF document text
    • http://daddytestit.xyz/vugamunudasunedozujogumakr1hci.pdfIn PDF document text
    • http://hopecommunitynaz.com/41865680866kg3hw.pdfIn PDF document text
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/dawomesemezomewitu.pdfIn PDF document text
    • http://creditchecktotal.info/how_the_metric_units_for_length_volume_and_mass_are_related9vboz.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/mezopodok_filukumojedolub.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/j4mOfjL/kizuvalon.pdfIn PDF document text
    • http://copyrightsupport-ig.com/xajobovl16ga.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/davolazupivowi/bard_guide_3._5.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/zibametuxusazoxeba.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/english_to_urdu_translation_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/yearly_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/99353566446.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/video_converter_online_to_mp4.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 5732 bytes
SHA-256: a9bde15b5a37e2e923ca46971cba45a60d63f44e0cc6af05920e80cc52c77b3f
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 10932 bytes
SHA-256: 982423eb1d60bfffb8c233eb8b8abfba8e9d348a78c17046017752c166f35d27

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