Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98a3c9b2f42a8fa…

MALICIOUS

PDF

73.9 KB Created: 2021-03-17 03:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 06bd4d308a78bcdea4c5fab88f6ade6c SHA-1: 5891248da6e2446ca82382c6bf83aefe40c8d4d1 SHA-256: b98a3c9b2f42a8fa207278a249ca731c706f0f2d7ac9ea2c81fe2910d8ddec34
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-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://midufefew.ru/wix?keyword=crash+bandicoot+2+100+guide PDF link annotation
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/4aed9b591.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/5654b52b0b87.pdfIn PDF document text
    • https://lizoranulag.weebly.com/uploads/1/3/4/0/134041515/zafubadarujel.pdfIn PDF document text
    • https://libigidibejaxa.weebly.com/uploads/1/3/3/9/133997225/45af1.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/bSmZPgi/get_likes_on_instagram_free_app.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/3f6d53adfa412.pdfIn PDF document text
    • https://cdn.sqhk.co/xojurolaruk/i0o1qhi/dexoguledovenadeluto.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/eqiacja/bloons_monkey_city_banana_farm_upgrades.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/gulapore/nidebiferizakesaba.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/what_is_the_meaning_of_strategic_human_resource_management.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_0680adcfefa9400482b7f82d1a0238d0.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_12461bf4015646bfbfd7c17aad68a201.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befarekogol/avengers_endgame_wallpaper_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/demonimujazotafobige.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/citation_for_bates_guide_to_physical_exam.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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 5540 bytes
SHA-256: 1a12b058c4ea200e66affd9594784c00eabe03e34926c33710fde0f8ac20258f
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 10500 bytes
SHA-256: d04af27c1e2f9714425ece0e850eff6c548cf9fc3867fa6a31faf359b3171923

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