Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c955230812e6a1…

MALICIOUS

PDF

90.6 KB Created: 2021-03-23 07:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7c2c364b6950ba9d5614e4cb12d1ac5c SHA-1: 17994b1741cb78a28291830cd7e701680ebc89c5 SHA-256: 90c955230812e6a17394df2bcbf859cf26ababd7eaf4e4604470269c6acc5143
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to an "android app" to entice users to click on the embedded links. The presence of multiple external PDF links indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/123?utm_term=guitar+chord+finder+app+for+android PDF link annotation
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/4892006.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/21zcVjh/21616901229.pdfIn PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/6815c08.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/8jagwhb/jixeloxuwirobazetega.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/5553195.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/b8ORpjg/terra_mystica_fire_and_ice_reprint.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/dggw3gr/29060883814.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/Jvehbgi/bevikelatigizo.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/lzibQHa/black_friday_baby_deals_2019_target.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/dfdb894d88129f.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/fLnjjyn/1209001463.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/jFeajhN/xojobovemevalifosa.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/UXqhchi/zofijifotofixogifogogu.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/sebunuzu/ropizedepaf.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/71824844257.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/46491007012.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/safety_1st_thermometer_ear_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcb494c-4e0e-46d6-9efc-d91f60c54ba4/6788070554.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/gitolezawe.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/troy_bilt_tb240_starts_then_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d33ef7-22d7-4a9c-a464-ba95e20bde04/stanley_tre550z_electric_staple_brad_nail_gun_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/totajapa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 5064 bytes
SHA-256: 1743c9d17e3772a090dae2fd64d77879a138d52118294a5a120cd52696d12927
font_01_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 10980 bytes
SHA-256: d53296fa792d328494e1874ad448ab1eb921b4794b16c5f63b6df996ede3c66e
font_02_sfnt_off000146a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A3 16304 bytes
SHA-256: 0a2507360a40dd56b84230664db2b3a2689cb34b0aa642599c8245950ba374cb

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