Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cc77b3ddc2e6b7…

MALICIOUS

PDF

83.0 KB Created: 2021-03-04 04:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f47e186340340818627dfd594818d990 SHA-1: df3108e46210365d226ce35d703a818ca210a51e SHA-256: 91cc77b3ddc2e6b7581a9f67e152be10553ee84d6356f475faf872aa1f9837f1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable domains or link farms, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=what+are+three+types+of+structured+data PDF link annotation
    • https://cdn.sqhk.co/fepotifomowa/kjeNJjd/86902022162.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Y8qEigs/10172524135.pdfIn PDF document text
    • http://artdebug.site/wokikukatugapazisadvjpji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_60207e3773c50.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/jjk06dw/96909872235.pdfIn PDF document text
    • http://fruits-summer.fun/waviwawogoxamajibumavotuzw3ojg.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/1156764.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/94ac13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602c1f9c87ae6.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/207659faf8.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/Iphigi6/5523398291.pdfIn PDF document text
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/2139419.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/891a8d42a31d0c7.pdfIn PDF document text
    • http://generalmassage.online/tikunotuworuzoheq.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/IhjIgjK/zabaledaxinuxedikefixa.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/yKhdhem/diablo_immortal_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ih0gehd/goldfish_pinball_blast_apk.pdfIn PDF document text
    • http://bet-info.ru/3d_jigsaw_disney_castle7dfdm.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/nefomojuwet/bogan_tamil_movie_audio_songs.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
    • 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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 5056 bytes
SHA-256: f0b91d4b31ff68d1cb41d9a1b7f0fd21c55217644073a7ebeaa5ecaf4c157375
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 10232 bytes
SHA-256: be967fb090149f33f5c1507a738060548c0a8724ccbf9e6dd9e67f67f355adc7
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f
font_03_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f