Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a258201a9b783c…

MALICIOUS

PDF

100.9 KB Created: 2021-03-09 00:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16f107ec3fccdde094f837f577add4c1 SHA-1: cbbffee78e7cf9ab3b9c6fe10e86fd40445d1083 SHA-256: e1a258201a9b783c5a5a7896f9dace99deac42bfc9c0cc1421d08c919f57d506
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

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
  • 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://baarspo.ru/strik?utm_term=why+does+my+soundbar+skip PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386091/normal_602da494437d2.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/13554517455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fef16327c9b8.pdfIn PDF document text
    • https://tajaxaxiko.weebly.com/uploads/1/3/0/9/130969751/8a226ea9.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/can_you_lose_weight_just_eating_tomato_soup.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/9a04568660aa9d.pdfIn PDF document text
    • http://nutejujaxi.66ghz.com/kamatemopasopevuzigele.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/paint.net_open_source_download.pdfIn PDF document text
    • http://tenefadapom.iblogger.org/happy_birthday_mom_images_free.pdfIn PDF document text
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/mavenetabifuvu_monogufawetidu.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/1066476.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/zumimexivepuwuw.pdfIn PDF document text
    • https://misikozi.weebly.com/uploads/1/3/4/4/134443183/abe04d49.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/pubopikij.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/genewodulanodifine.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/dulupejubogexupif.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/wusone/72153003359.pdfIn PDF document text
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/basew.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/how_to_remove_ice_dispenser_cover_on_a_frigidaire_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/bandook_chalegi_video_hdvd_9.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_off00014ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF8 5488 bytes
SHA-256: 9802310537d60a682d607159a3002c1f29dc9fe763dc7cbfdbb831a8f0794d70
font_01_sfnt_off0001617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 10932 bytes
SHA-256: d8d71a5a7fc5a1fb210af38648291f389bab3852964d23c087e51150ca7ff8dd

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