Malicious PDF — malware analysis report

Static analysis result for SHA-256 143aacb2045c1e60…

MALICIOUS

PDF

77.4 KB Created: 2021-05-10 04:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 74986c172c2d3b910e7f389844ab47c2 SHA-1: d1af738ba214590d778eab109d17b7f73640f561 SHA-256: 143aacb2045c1e6035c7cdc88238c4e40df21f664cb845b161e21e9bda0be241
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary external URI, 'https://xezojetit.ru/strik?utm_term=delonghi+pinguino+portable+air+conditioner+not+blowing+cold+air', suggests a lure related to product issues. ML and ClamAV heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=delonghi+pinguino+portable+air+conditioner+not+blowing+cold+air PDF link annotation
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/mulidikeninew.pdfIn PDF document text
    • https://sogutujugaj.weebly.com/uploads/1/3/4/4/134403955/8693348.pdfIn PDF document text
    • http://lebanage.iblogger.org/ejemplos_de_anualidades_vencidas.pdfIn PDF document text
    • https://zanemuwezujapab.weebly.com/uploads/1/3/4/7/134765617/f39dbf6a.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/daxeg.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/1331734.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/jjVcgil/best_open_world_games_for_android_quora.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/vazezisosejitofe.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/58285853699.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/gigjeih/biwesisozusunar.pdfIn PDF document text
    • https://zalidumi.weebly.com/uploads/1/3/5/3/135351231/ba82ad1.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/sizoramemir.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/hdiijjD/4897807682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forubav.rf.gd/dr._ali_biology_book_for_neet.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/2148861382.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/tororusugebepewule.pdfIn PDF document text
    • http://dezofavikunelev.epizy.com/77570992475.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/77320288937.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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 5388 bytes
SHA-256: 29f5466d1b565620c61b9ed6442191676861b21ce974a819b131f451f2feb334
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 11244 bytes
SHA-256: dadc926a587d400b2a6f5023a5ea134c36b515b02ab226eacdaf9178fe3ea78c

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