Malicious PDF — malware analysis report

Static analysis result for SHA-256 782d51e4a816f30d…

MALICIOUS

PDF

69.3 KB Created: 2020-11-26 00:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d23db77822eb2346561deb8968108d55 SHA-1: 3692661aa2d1893585a6d697a03f7ecf07e8f55e SHA-256: 782d51e4a816f30d2fec1b7084edaffaca1a1f613c39ceaedb5f15225fea2b9e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. One notable URL, 'https://trafffe.ru/strik?utm_term=sql+drop+table', appears to be a redirector, potentially leading to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=sql+drop+table PDF link annotation
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/vurab_tenazadow_nowenu_bulejagonela.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/tanuw-ramizog-rugab-wijuxisuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f90b96cc85b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_5fb3c8c553257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5f8e8c4e2bef6.pdfIn PDF document text
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/6610379.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/sovuzer.pdfIn PDF document text
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/409ab2607960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa049c5d5fa1.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/xotuj_ranekoveruk.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://uploads.strikinglycdn.com/files/9fbb03ab-4ed6-460c-9eee-22ade8a8b14e/alma_lopez_and_michael_naccari_wedding_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740505d4-0c2b-499e-945f-7e620d2da63b/2018_ap_calculus_ab_free_response_question_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7b663c-cad4-48dd-a7e5-3b0925dcada2/74595949864.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_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 4776 bytes
SHA-256: aba5baf4d15be4fd5f0da596b3d3e12727889a15cbdace02746ac47dad04fbae
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 11608 bytes
SHA-256: b9c256b30ec38f61a8bcbf57287ab1d1edd34c7087e0064a1c06b38d4c7f9daf
font_02_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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