Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18816d5e100381f…

MALICIOUS

PDF

66.3 KB Created: 2021-05-24 19:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: edea4bc3d6d8542bf178d1b64237de40 SHA-1: d516773b3969c4eceb28582df1346ee0c9616acc SHA-256: c18816d5e100381fda880a1dfb7de7ac6ab1aa7fdbf187f161d187f4a6deb9b0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

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://soxebez.ru/strik?utm_term=absolute+value+function+transformations+worksheet+answer+key PDF link annotation
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/da3ea985a5a.pdfIn PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/6a8bf223b8a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484143/normal_5ff280bda66d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5fcc0262879b5.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/zepax.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/3676920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_605cb2c597c86.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/jabivi.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/597d553886d52d.pdfIn PDF document text
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/8584539.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/fotojipifuzitul/swot_analysis_template_excel_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/22568082365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2716ef88-2111-4ae3-a399-f5642998d158/vikedo.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/96862395789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251ea915-3b0f-45d8-bc9c-a342c31a1924/why_does_my_hp_envy_4500_keep_going_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818e3872-4b17-42e1-9ccb-6a7d53487d64/xozoxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e53d873-fce1-4ca8-babc-b4ef4f66a19d/how_much_do_tow_truck_drivers_make_in_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18663ce2-cade-4608-9bbe-450c5e223069/wefepavoxorimukerurusajap.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/hermann_hesse_steppenwolf_quotes.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_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 5568 bytes
SHA-256: 1e5d7eabc082479547010caafeabcee01e019e08787a35d2205ddd98d49b44c5
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10508 bytes
SHA-256: 06d86bf23c4a6f03708827324e84ec7bc45cafb096027045c4de1b58042d180f

Open this report in the interactive analyzer, or submit your own file for analysis.