Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb2c8ea8bf57b53…

MALICIOUS

PDF

82.2 KB Created: 2021-03-03 19:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c087752b5481744f9f007fda10ea5624 SHA-1: bc0685c4ff9b709264781cc454c856e290958ec2 SHA-256: ecb2c8ea8bf57b537ccd7363730b08b4cd49fc00aaefdb423b11b46e46580bcf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crophysi.ru/wix?keyword=ffxi+solo+leveling+guide+2017 PDF link annotation
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/zepepo_kerupov_suxebefatutupe_juvoji.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/mikuribusodejid.pdfIn PDF document text
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/paxuzek.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/1614108.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/gjbjgaF/farm_family_life_insurance_bill_pay.pdfIn PDF document text
    • https://befojawukirafa.weebly.com/uploads/1/3/4/8/134855882/nirotetozaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_603757cd8d467.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
    • https://s3.amazonaws.com/xafaxotaful/73686570054.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/97801081243.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/borudunazimegoxevog.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/canada_food_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/11767890729.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/lcm_and_hcf_year_6_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/danly_guide_pins.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/10967558693.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 5060 bytes
SHA-256: 4612db5a50be926d1c89e166afd027d24e42d8ddd2413b1bd49f8cf51d8ff739
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10816 bytes
SHA-256: 895fc2116650bfb4ea2abb598e23252f54d53a6a9a5a958eef4b59ca426a8745
font_02_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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