Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad21bd1468c6e45…

MALICIOUS

PDF

133.4 KB Created: 2021-03-27 20:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72383a9ff1c5db24814e0567004eb298 SHA-1: 2ab40a20a57ecb9d9a2f097b686dd42b901a6878 SHA-256: aad21bd1468c6e45f58535e9979eb1ce2a38547ec7dc0ab6b346d682231af282
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded content, though heavily obfuscated, appears to be a lure related to programming a Samsung washing machine, designed to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=how+to+program+a+samsung+washing+machine
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/6939796.pdf
    • https://lifunakejeka.weebly.com/uploads/1/3/4/3/134358873/5199a33.pdf
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/8225368.pdf
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/5289693.pdf
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/talenanajamanivetan.pdf
    • https://cdn.sqhk.co/wepunajexiju/ihfXhhd/46004514821.pdf
    • https://cdn.sqhk.co/nevupediwix/hjcjefd/42524127362.pdf
    • https://pafekirikigu.weebly.com/uploads/1/3/4/5/134590200/nuxowivalibi.pdf
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/vogefel.pdf
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/1488049.pdf
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/b8d7e.pdf
    • http://nefidale.22web.org/kamen_rider_kabuto_anoboy.pdf
    • https://paxuweveli.weebly.com/uploads/1/3/5/3/135320709/lenol-renexumuzo.pdf
    • https://cdn.sqhk.co/pawapoma/hfhj8lY/suppository_definition_synonym.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://posujozu.epizy.com/lahanpan_dega_deva_song.pdf
    • http://sadabodavezuzi.epizy.com/boating_exam_cheat_sheet_canada.pdf
    • http://dupizorof.rf.gd/dell_poweredge_r730xd_spec_sheet.pdf
    • http://tukakuze.epizy.com/10777440871.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e4.bin
3ca4c9c555865f2ae939689a3350d02b6d140dd3a285f089762da246db0be25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 67440 bytes
font_01_sfnt_off0001c2b6.bin
3b4917c47294b38f07714072860d3877aed24f602a7279f153c08d7f7e564dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2B6 5252 bytes
font_02_sfnt_off0001d471.bin
70a6a6fa706be460b335a1139cf6f74343469f68e24c7ec63c6a638fe0b582db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D471 10996 bytes
font_03_sfnt_off0001f9ee.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9EE 4324 bytes

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