Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff05d776611b9aa…

MALICIOUS

PDF

85.1 KB Created: 2021-02-21 00:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2a176b8e5e196352cf022ed960d25cf4 SHA-1: 7d5b1a0dd8438f8920448e2b73775e87fe880308 SHA-256: aff05d776611b9aa44cabe007633cd1ef832b5045f19655d4640fa8115474efb
204 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a washing machine guide, aiming to trick users into visiting a compromised website. The presence of malformed exploit streams and ML classifier flags further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crophysi.ru/123?utm_term=how+to+use+speed+queen+front+load+washer In PDF document text
    • https://cdn.sqhk.co/pefibovip/dgdwghi/toca_train_full_apk_download.pdfIn PDF document text
    • http://tubiwupijekowam.22web.org/97718623228.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/721X3y1/beripukotedakogejunipo.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
    • http://rarovuvoj.epizy.com/64629064919.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/bible_cebuano_version_free.pdfIn PDF document text
    • http://xokofenox.epizy.com/charity_letter_template_asking_for_donations.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/edenpure_scalerid_reviews.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/19674082745.pdfIn PDF document text
    • http://sufapanizesemot.epizy.com/rafoxugewetusulupoke.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/british_museum_ancient_greece_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/gepiro.pdfIn PDF document text
    • http://genobobef.rf.gd/nenasivujibobor.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_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 5144 bytes
SHA-256: ea40b57d2431f170b05a2f809257b37502aff13c4f0b9163697a0b43c23fbc74
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 11364 bytes
SHA-256: faa536b0bc819dd9accd18b8f847d65bfb59c3e816589e2bec4e674dc93db78f
font_02_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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