Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa888d226f20be23…

MALICIOUS

PDF

72.5 KB Created: 2021-03-03 03:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9fd1e55eaa3978d3bfe9e268a7b0042 SHA-1: 3f3e49032d30705a524a3f1072340c85ddb37462 SHA-256: aa888d226f20be23c0f991d464f0e834c0c0ff2cc0ee0387ddb02084265b3c5f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=west+bengal+police+exam+question+and+answer+pdf PDF link annotation
    • https://cdn.sqhk.co/nejisakatok/3hgNLjg/fejimigenetazedokinowunov.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hajiyig/jesus_bible_stories_for_toddlers_youtube.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/vogemavadok.pdfIn PDF document text
    • https://guxadudupis.weebly.com/uploads/1/3/4/7/134751999/kavavomenedagaxetu.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/eWOV4ib/princess_cruise_login_travel_agent.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/jfBg4id/legend_line_color_matlab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_603c636ad08b6.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/hhrgdGo/fun_reading_comprehension_games_for_3rd_grade.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/3c17a6bf37.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/vozofaju.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/duzexefemosaxe/xupig.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/99420062350.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/farozapezufedivovegidukud.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/bostitch_n80sb-_1_framing_stick_nailer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/funny_smile_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/25722496256.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/posuberumoxaroluru.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/zezojowujuravapugidosu.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/burattino_senza_fili_2017.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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 5916 bytes
SHA-256: b7786719671d53d592d37594973024ebd97ec84b08871da9849c85e137519a2f
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10488 bytes
SHA-256: 864525cb3f00736da95aa249c491d8316a90482719adfa64d6f8cbce99095900