Malicious PDF — malware analysis report

Static analysis result for SHA-256 55493f7224049917…

MALICIOUS

PDF

71.6 KB Created: 2021-02-18 00:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6ea241c28033644db939f21c9f119c9 SHA-1: e8c679d5eb33c6792627944293fe6f8adcaf04f2 SHA-256: 55493f722404991795f57a667f4d7f54ee69fb951efc0b23c219b1e63afa4534
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or malware distribution lure. It contains a large number of external links, including one pointing to known malicious redirector infrastructure at `https://crophysi.ru/strik?utm_term=how+to+get+a+great+workout+at+planet+fitness`. The presence of numerous PDF links suggests a link farm designed to obscure the true destination or distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+get+a+great+workout+at+planet+fitness In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_601a6d0110502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_6023b5c409565.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/4545456.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/mokelexolazobi_kenaw_naxewup_kuvisumasesep.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/02e4bb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_5fd906f204630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_5fee3c805ced1.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/24e487b4.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/Qiame59/run_2_unblocked_games_76.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/borokegujuzero/audacity_plugins_free.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/module_7_topic_3_drivers_ed_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/bc_firesmart_homeowners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/38944939608.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/congenital_adrenal_hyperplasia_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/dokusirazajaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/calculating_surface_area_of_a_cube_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/area_and_perimeter_of_rectangular_prism_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/suveritibefajebonuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/96912373965.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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 5184 bytes
SHA-256: 60a0565cf3fb0f3536ec35e1d505a8d1677c148a8014bb2756675b6b74f5211e
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10612 bytes
SHA-256: 5b92699f55373db3133a052f1509aec1922d475aefb66e7abf03618208905c7d

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