Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8545b0127b66719…

MALICIOUS

PDF

85.7 KB Created: 2021-02-23 16:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e4a94e9a547ddcf30ad65ed68620d2c2 SHA-1: 470302a7fc5323e03d22f749aaca31e766e0f4f3 SHA-256: f8545b0127b66719ae01a769405415c221794e67b166f0488fca9694490bb72c
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Toro lawn mower manual recycler 22', likely to trick users into clicking the malicious links. No scripts were extracted, but the presence of malicious links strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wix?keyword=toro+lawn+mower+manual+recycler+22 In PDF document text
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/0e8e5e755d.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/eceifD3/59872727978.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/225153.pdfIn PDF document text
    • https://koloxajemixe.weebly.com/uploads/1/3/1/4/131482821/tonuguretoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/belapawerezuju/navusavixedilipubilolibud.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/bhakta_siriyala_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/795399168.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/farmall_super_a_attachments.pdfIn PDF document text
    • http://bagobopog.rf.gd/application_of_bacteriophage.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/prepositional_phrase_practice_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/growth_of_administrative_law_in_india.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 4796 bytes
SHA-256: dd10b14125e6d100dc851e984d1a340c8dc6a5aa52b381eef3e7d80e09bbc1a3
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 10660 bytes
SHA-256: 71ae4d0597dc670d67829548cdd7b401ce64ef2431497591c9bdd76d2dc85b8d
font_02_sfnt_off00013bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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