Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff2fbc32fb65e04…

MALICIOUS

PDF

79.2 KB Created: 2021-02-25 15:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8440e903a305ff4d71976696ae50acbd SHA-1: cdb2b092ac592163dc83eab5a12c84712ab2df77 SHA-256: 9ff2fbc32fb65e04e58ebe3666a0963b6a8268a16722bb2a2e6c9d7de1ef3621
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated programmatically. The numerous embedded URLs pointing to disposable domains and potentially malicious redirectors strongly indicate a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

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 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.
  • 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://yafferge.ru/strik?utm_term=the+sea+of+monsters+summary+chapter+by+chapter In PDF document text
    • http://serdyukov.pro/push_and_pop_in_javascript_examplemmyep.pdfIn PDF document text
    • http://hydra.moscow/pinata_hunter_3tiiiq.pdfIn PDF document text
    • http://criticcxck.space/which_of_the_following_is_an_example_of_lateral_thinkinghbw69.pdfIn PDF document text
    • http://trokot-roznica.xyz/loviralwl0m.pdfIn PDF document text
    • https://geziduvugizi.weebly.com/uploads/1/3/4/8/134862990/8728151.pdfIn PDF document text
    • http://all-host.site/raputatasegijof6gl0k.pdfIn PDF document text
    • http://organicnu.info/snl_bird_family4oss6.pdfIn PDF document text
    • http://oneplusonemain.xyz/what_is_sub_area_meaningq81au.pdfIn PDF document text
    • http://gatorama.fun/18400081205bopwu.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/wemupajese/moviduxikamowaxuxe.pdfIn PDF document text
    • http://rowomikaxanuga.rf.gd/12213987570.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/xugomej.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_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 5416 bytes
SHA-256: c315068ff6b0de6040719f242e1c15dddbef7f3c2e0f80ab675a0439eb897698
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 10408 bytes
SHA-256: d127f5efbc7e67f419d35ba0e304e4a60ed3071c1b3bd750ae4bef6149e446f5

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