Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53bc25e9c977470…

MALICIOUS

PDF

78.8 KB Created: 2021-05-20 04:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3b94bdf31fdcec823b974308bd2a369f SHA-1: 2f44f9d08839eda3f44956878c6d5b81d566578d SHA-256: a53bc25e9c9774703ff284ba90a5904c6cb2a4c0cb81be1c207de463319ecaf1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, characteristic of a link farm or SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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.
  • 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://druttle.ru/strik?utm_term=juegos+divisiones+con+numeros+decimales PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370547/normal_604ac747b19c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501201/normal_6000fb138158d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_60554d0f58136.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/pinodirizuwubepikeb.pdfIn PDF document text
    • https://maloxozalujov.weebly.com/uploads/1/3/4/6/134624338/adb2588c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_6023dc6896572.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/bazimaramijonosev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604850234f493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_603c548892f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_604a8aca338f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5fcd259cdc439.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/vubufef.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/d1b337220.pdfIn PDF document text
    • https://revapukas.weebly.com/uploads/1/3/5/3/135323612/zizugufakevetagaje.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/6e0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_600b462f1af2e.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/2809841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_601093a1341a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_60053b3d22097.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/5752110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_602c8ad685c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_60349b7d22702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_600b9e9625dfd.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/gateme/rupinder_gandhi_2_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/begipok.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/what_are_the_different_nikon_lens_mounts.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 5108 bytes
SHA-256: 5f3f248a0cc3c18e0ef4618765df3b9359c0f860d6b228c751b84d2797f6a6f2
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 12516 bytes
SHA-256: 9e1771ee196a182b565b95a3d68380a7ce82feab1d16d249a0083a96911ffc3b
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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