Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfd9212c2881a2d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-08 18:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 798e2b4d1e157ff225b5a2ab5b85ced5 SHA-1: b34ab06d3d3d2aca780e09423a3056e960d48210 SHA-256: bdfd9212c2881a2de28ccc20317c43785e956bf0122d08932261e5daaf1542ff
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to an instruction manual, aligning with phishing tactics.

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 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://resalured.ru/wix?keyword=sony+playstation+3+instruction+manual PDF link annotation
    • http://mixezitubut.mygamesonline.org/takexed.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/lurivape.pdfIn PDF document text
    • http://ipai.online/applications_of_hplc_chromatographyhns5s.pdfIn PDF document text
    • http://1xbet-football.fun/97583397716pimpf.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_is_a_high_conception_rate.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/garmin_gns_430_manual.pdfIn PDF document text
    • http://smotrikino.fun/greenlots_stock_symbolgnd5b.pdfIn PDF document text
    • http://tekirivira.iblogger.org/11648236566.pdfIn PDF document text
    • http://medicinfo.online/palutenekoqggmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokexodine.rf.gd/the_goetic_demons.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/2006_ford_6.0_powerstroke_oil_capacity.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_7c721db009ba4f0cbbb8de11c85b57e2.pdf?index=trueIn PDF document text
    • http://zulalef.rf.gd/79038035483.pdfIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_8207a205d3164c59a5a30c9aa593e0f1.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_b6b92d206c504f02a97ecd2eae7cadd7.pdf?index=trueIn PDF document text
    • http://bapibalapu.rf.gd/tenuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daeb3b1-521d-4d4d-b503-8b8fc3092abc/belakafup.pdfIn PDF document text
    • http://fugebuxojawuris.epizy.com/software_issue_tracker_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9410a5cc-9436-4d39-9f40-69eb2d647149/3434921957.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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 5448 bytes
SHA-256: c1fd3e3f0ed10d6b4686f781836b22097e818924e9bcd6766f31abbbd53f9183
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10128 bytes
SHA-256: 84c76e18778949e0a52fa7c886bc2a8237555656ee083b229a8d3d333c600c9d

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