Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff574fbf4fb6fda…

MALICIOUS

PDF

119.8 KB Created: 2021-02-23 23:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d8d4954113bd522b9e18ce1a4e1dbe17 SHA-1: 7a0d5adf81c0c01ddc449899d61b1e817b321f94 SHA-256: 8ff574fbf4fb6fda56bf9313b50e4b70a232d00ef09903372b064dbd93d5d973
184 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, and is detected by ClamAV as a phishing trojan. It contains a large number of embedded URLs, with at least two identified as redirectors to potentially malicious infrastructure. The document body, though heavily obfuscated, appears to contain text related to the embedded links, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/strik?utm_term=does+silica+dissolve+in+water In PDF document text
    • http://mivukiwoluwuj.iblogger.org/how_to_winterize_simpson_pressure_washer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424637/normal_5ff8a305426c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60155c2231202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5fd66bcb4b6b2.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/7909340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_602ab7efb5401.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/zadigatufadozafema.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/xanejozanajufasaso.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/4668b7af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5fcf9faaadbf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5feb62e1998d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risogida.rf.gd/vaastav_full_movie_openload.pdfIn PDF document text
    • http://purubonosarule.rf.gd/92248137752.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 6492 bytes
SHA-256: d2077f5d6d5b1d677d9b6d000eb087611a047961d42ceeb980acba3b54af8b85
font_01_sfnt_off000179f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F8 5084 bytes
SHA-256: f2d96d1a76d8ca098e75c54670a7851eaffd45816880ef366fabf4fb2bed8580
font_02_sfnt_off00018b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B6F 15496 bytes
SHA-256: 6a3deadceff33a228a1161092e786d16944bcb9d866c3a03ac0117ae6f65c193
font_03_sfnt_off0001bc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC29 16172 bytes
SHA-256: 6def86e2184485ca1a2cc260b0dcd560f1a94de5ea1a0cf2471977805890e989

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