Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb1dcdc71fba351…

MALICIOUS

PDF

71.8 KB Created: 2020-11-10 03:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2afd864f00773de681c45ca25e858d14 SHA-1: 8c376b19e9200d8bd144c3e42b307f0a88d2d3ab SHA-256: 4fb1dcdc71fba351afec7316f5871c1944c75d14f58ce1d535fd4c5fdffceb96
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and a link farm, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains keywords related to 'Expedia.com hotels english', suggesting a lure for travel-related scams. The presence of multiple PDF links and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?keyword=expedia.com+hotels+english In PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/gozesoru-tanugawivabuv-liwivubid-kijufatasuli.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bolirib.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/fevizox.pdfIn PDF document text
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/a17e97e4a9ee.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/9ef0b499d85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae93badb-6bd4-43ce-9c1d-4642d3e52b40/40896644900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2710ec5a-60d2-4e4b-84d3-d30f1c6237e4/63449179852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734c6bab-a197-4bed-b48f-508b55e04a9d/kinujefijibofuxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84f2ef6-3fb3-4be5-b8f3-bd500801a762/nibipidel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e6c18b-2af2-46d0-a855-948f7f60dd34/lorulok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35735473-482a-4a32-9bc0-731c85e4e9fc/florida_dcf_forms_work_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a91885-6076-44a3-9783-ee6a19e59a49/kyocera_hydro_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0ec81d-9b8f-415b-b90d-20fd4c8742b5/owners_manual_2016_chevy_silverado_1500.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 5448 bytes
SHA-256: 9a9b9090b2cfd93a723f12937da993491ef4532e6e67fa0693b68ff6e4962920
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 11040 bytes
SHA-256: ee44c5294d363ff8a465e56fb9f3fe9af49279b6716a187d631edc7e04dee974

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