Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a56cccca62dc14…

MALICIOUS

PDF

64.9 KB Created: 2020-12-02 10:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf9ec161021c387d8cb2dcc33dafd29 SHA-1: 1d85b7241f2d16e48ac22b712162a4f4820c1678 SHA-256: 33a56cccca62dc14355b0f89b3025197953934b1fb92879cb4459e36c2293e0c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://trafficel.ru/aws?utm_term=join+excel+sheets+online', is presented with a deceptive pretext related to joining Excel sheets online, likely to entice users to click through to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=join+excel+sheets+online
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/8137537.pdf
    • https://duwelebizan.weebly.com/uploads/1/3/4/7/134701088/fodumuduja.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/7771716.pdf
    • https://suvuzijovibalis.weebly.com/uploads/1/3/4/6/134660606/1f89687e249010.pdf
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/1659571.pdf
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/3550991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nevowimo/26861981773.pdf
    • https://s3.amazonaws.com/wenobagupexekap/wedojelowoner.pdf
    • https://uploads.strikinglycdn.com/files/9e332ef9-9ee6-4e07-a195-aea3c09dc842/57549974430.pdf
    • https://s3.amazonaws.com/subud/1635850136.pdf
    • https://s3.amazonaws.com/xoxaneral/42191823378.pdf
    • https://s3.amazonaws.com/bepukuba/31365718016.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c476.bin
4f6c704ab20b0b0880b043d1974e8660a03779a517e1bba6c250b6034b2fae11
pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 4636 bytes
font_01_sfnt_off0000d43d.bin
6d0437f77e170ea2b6f14c6933d484ce083a55f7c8ab7a147544118bcacf93b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 10152 bytes