Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a532e8c4cd7416…

MALICIOUS

PDF

100.0 KB Created: 2021-05-07 14:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0b24a11a2799e6ffdb37a1721d3ad729 SHA-1: 8098e120ac9b31d1d35faeaa0c8ab7a2e18d43c7 SHA-256: 73a532e8c4cd74167937b516d86fb89f3aec1caf7547ac85a169fe634c49d97d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The presence of a specific search query in one of the URLs suggests a lure to trick users into clicking. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=what+battery+does+a+citizen+watch+take PDF link annotation
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/misevej_lelixaj_kujub.pdfIn PDF document text
    • http://straponartist.com/xitetekemasupuselotis7o8jl.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/iaNicvy/28506717728.pdfIn PDF document text
    • http://wide-do.top/pl_sql_to_date_format_mask7b8lb.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/lllxhiD/5086576880.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/dRii2TT/icymi_news_meaning.pdfIn PDF document text
    • http://dkmz3.club/quantifying_biodiversity_spider_lab_answer_keywztgd.pdfIn PDF document text
    • http://medyayazilimtr.com/american_idioms_and_phrases_with_examples_for_ssccgtyl.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/zuniva.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/bVGjie9/hard_rock_cafe_music_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6014d6195ed6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_6038d6699b37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_601cddffe24d1.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/45812961977ymmj3.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/Xjgihjf/fun_reading_ideas_for_middle_school.pdfIn PDF document text
    • http://worldhold.online/2kids_in_a_sandbox_videodk6yy.pdfIn PDF document text
    • http://lunesygets.xyz/globe_mybusiness_prepaid_internet5gq16.pdfIn PDF document text
    • http://my-favshopf.online/calfresh_application_spanishqyyc3.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/fatikonavori/sql_server_2017_setup_free.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/43685624822.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/joining_report_sample_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/blank_timeline_template_word.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_off000146b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B2 5456 bytes
SHA-256: 911c39f71b47d312bfdf3d79a0bd9925dda8628fdc6c6f21b517462c5b739c14
font_01_sfnt_off0001595c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595C 11848 bytes
SHA-256: 2b344c9c419f9368d7287d655a8132247deb07d0cbcc2c57aa73f90100886562

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