Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a52e7fc80f5a6de…

MALICIOUS

PDF

68.8 KB Created: 2021-01-13 09:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f393879d2e6edad16c9037cdbeeb7c62 SHA-1: bc50fd8e9a364f836213f506c29883fc47457561 SHA-256: 1a52e7fc80f5a6de8bb7a5c2ceeb430b43195dfe9a6f116f67a1b934840892fd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to drive traffic to other sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=native+american+seed+bead+jewelry
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/5075923.pdf
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/xukimumijuromawo.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/982156.pdf
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/f89bae7d8c52f6.pdf
    • https://site-1180242.mozfiles.com/files/1180242/dragon_ball_legends_twitter_friendship.pdf
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/5444142.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/91d506852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juzerilem/rupefasubijikaluzuz.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/gmail_contacts_list_android_phone.pdf
    • https://s3.amazonaws.com/pusori/gubajo.pdf
    • https://s3.amazonaws.com/tokafanawa/kulorututibaxo.pdf
    • https://s3.amazonaws.com/najubu/adobe_photoshop_touch_apk_download_latest_version.pdf
    • https://s3.amazonaws.com/tobojelusiwi/mavilulux.pdf
    • https://s3.amazonaws.com/jeworurowam/ssc_stenographer_2018_notification.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_off0000d035.bin
e409b55ab46a5949e162266809857380f5326c912fb30aad32193fd020b541de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 5524 bytes
font_01_sfnt_off0000e309.bin
8529673a0eff937eeb6298aec1219e8c80fbafb786f0c122a02dd7d061757f72
pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10452 bytes