Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7bbca90a92e673…

MALICIOUS

PDF

84.5 KB Created: 2021-02-23 06:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d394f544478fc4c35cce80287e857838 SHA-1: 8b2709da85176f1b9f3f7370e39f117bb087a56f SHA-256: 0d7bbca90a92e6733541d34e2bea70feab1e00d39734bd472da28b933e1c6822
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains text related to 'ultrasonic aroma humidifier' and 'wkhtmltopdf', suggesting a lure for SEO manipulation or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=how+to+work+ultrasonic+aroma+humidifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495707/normal_602d52e12a6bf.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/aLhjjgR/jolteon_stats_let_s_go.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/Eji0Ihf/black_friday_tv_sales_best_buy_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/ievgche/sales_management_software_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/OjjyjjU/8602166448.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/roxapegiremifi.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/ggghjXP/mefibog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5ff765c6380f6.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/fxihECE/74265809370.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/romuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/K4zh5gg/70599483091.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/gghh3gh/personal_swot_analysis_test_online.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/xuzovudit.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hiQ0a3w/semavawuwewi.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/GhmidqT/kung_fu_zero_2020_movies.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/wolina/34688358020.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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 5376 bytes
SHA-256: 48d5f0864770a2e117a946701f0065fa57d79ef5686c6f86796a8eb52edb2031
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 15516 bytes
SHA-256: 63e1cac75dfa10c829d161b306c07985a94a5b0b703946cf5d8422b93ff87cfa
font_02_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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