Malicious PDF — malware analysis report

Static analysis result for SHA-256 489a7dc8e7ff22cb…

MALICIOUS

PDF

82.0 KB Created: 2021-02-20 21:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28ed3d3844bf25a8978d16cb619e6b34 SHA-1: 0cb19581645d0386ad4be4d99dd7ab20c75aa4e1 SHA-256: 489a7dc8e7ff22cb2ce062901148d28f413bc6d6ceddffb2ac11edf18d3aec8c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'letter soup game'. The presence of multiple external URLs, including suspicious domains, indicates a likely attempt to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=letter+soup+game+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5ffb4554e9ec7.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/xhbghpk/millionaire_trading_mom_reveals.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/oMh1gi4/spelling_bee_games_for_2nd_graders.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fe1d303b67b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467950/normal_601410ff84d4b.pdfIn PDF document text
    • https://zogewuvenofo.weebly.com/uploads/1/3/2/6/132683334/2906020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_60292c4486731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5fed550b43baa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6007a69d8c484.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
    • http://jufafiwosekugon.rf.gd/cloudy_with_achance_of_meatballs_2_berry_scene.pdfIn PDF document text
    • http://nodixuzotegiv.rf.gd/cover_letter_block_format_spacing.pdfIn PDF document text
    • http://kenamumiv.rf.gd/remulisuwinidof.pdfIn PDF document text
    • https://medlineplus.gov/recipes/soups/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 4860 bytes
SHA-256: 739d4cca266fbea8bcfa5f8a02f57ff7bb613b624f6d8ff214a266b69d2e0224
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10240 bytes
SHA-256: aff02ac09a677422283ebd4e6433814156b4887b58310913791239d512ba685a
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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