Malicious PDF — malware analysis report

Static analysis result for SHA-256 f547770b4c67da84…

MALICIOUS

PDF

69.2 KB Created: 2020-12-10 05:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c5a7b237bbc1d67325b4fca322e6a99 SHA-1: 09bb1144f9ec44cb2b9effdfdb37517ce7b6a56e SHA-256: f547770b4c67da8459544ae76ec7cbdd9aab3a7a787f8c7259e20116dc943a20
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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://trafficel.ru/strik?utm_term=asu+career+services+alumni PDF link annotation
    • https://ribimefisele.weebly.com/uploads/1/3/4/5/134516567/8f3e7fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fccdf5955e06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1520988c99b6d37aa082c/t/5fccc3ee8a55f2188b751239/1607255023796/gapabixomisekagodom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce777cfb1cfe1f8fb48c4f/t/5fd16515880fa23343c70786/1607558421737/stokke_tripp_trapp_harness_instructions_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77bcefc603311fbfa95b0/t/5fced742798354522dff1427/1607391043442/iphone_ringtone_new_2020_audio.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeed6a97599144ebc76ea/1606282968535/scotch_tl901_thermal_laminator_troubleshooting.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c001df132613bbbcfd0a/t/5fcb511bbce7087d1adb4154/1607160091824/pinix.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b53fc6229360ecb2a747/t/5fd0224f5efba8153b197bb6/1607475792720/free_tunein_radio_app_for_laptop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d0859698b02c7f425fc5/t/5fc9f55087b36f46d403b4f8/1607071059715/vedupuwematefobagoro.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59e7a97599144eeea7ff/1606375911858/zeduderun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc519ee9698b02c7f3bc40c/t/5fd036c2c0a29916a5641da8/1607481027217/ben_10_heroes_united_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc677faff13940aa265cd26/t/5fc983c82f5dbb44b771b864/1607041993078/diy_portable_basketball_hoop_base.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ef221452f90b7ff27d3c/t/5fcce7f5662d5e24e0a2634a/1607264245693/94871610558.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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 4992 bytes
SHA-256: 9bd15cc625e77698a03d86982675f818197692c88623f2dbc47f4490c7dc6104
font_01_sfnt_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 11756 bytes
SHA-256: 180013591f4712059058ca864661b2450338e57f1d55eb7e3d1b47b03161f122

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