Malicious PDF — malware analysis report

Static analysis result for SHA-256 187c9b8881d2bceb…

MALICIOUS

PDF

86.9 KB Created: 2021-03-22 18:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cdd6b00d2422dc60ffb0ae0d3dec0c4c SHA-1: ade751981634ddf11c18bf4f996b42aa70b05c92 SHA-256: 187c9b8881d2bceb5e30096d09026a01ca3ae35d65b4442f5794b400efa5f2c4
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 pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=sam+x+dean+wattpad PDF link annotation
    • http://sazewipeti.iblogger.org/sindrome_di_berardinelli_seip.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/99104699321.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fmv8l6s/taboxitakawazebuxavukexe.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/ldidBjd/super_smash_bros_melee_zombies.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/pharmaceutical_branding_strategies.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/all_passive_tenses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_5099c56509a8414d8514ab3d908485ed.pdf?index=trueIn PDF document text
    • http://pekiluji.atwebpages.com/gisogojapusoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d65f36c-ad1c-439e-ab26-2f02ef262915/56902486409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebb161b-0ee9-4097-a944-c18a66f62fb1/habits_of_mind_posters_free_printable.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_6afa40f7f98b49e6a4a90d91054cffce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/960fba78-d279-4a6b-95a3-647e3566bfc1/froggers_adventures_temple_of_the_frog_online.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/skyrim_mod_list_xbox_one_2020.pdfIn PDF document text
    • http://pefuganut.epizy.com/codex_adeptus_custodes.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_b242f5065a2f4879bf84d80a6fa2fa91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c470891a-b7fa-4c06-b90c-e62110edc248/suxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9212a372-2e49-412b-8a81-80a35deeeab4/how_to_change_watch_face_on_pebble_time.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_80e9255cdd4049fb8e360117a8fcdd0a.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013d9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D9F 6368 bytes
SHA-256: 670bfa102861334fb3b7a47267806f07d9b5d5f6f43a35bf7ae9b35b090e02a6
font_00_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 5064 bytes
SHA-256: 2e804612b7276ca799c4e6439c00e8fe01de3f825ede247b17717d5a5d301527
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 6988 bytes
SHA-256: d38098f63f63def4da8e6fef94135ec5756f967ab1df1a71cde1a44a343d7046
font_02_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 14600 bytes
SHA-256: 5a3905fec17917649c77905082a822765312ba520ef9ba6c785aece21dc9f76c
font_03_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16060 bytes
SHA-256: 2d97eb5b8c66583654a55461b75ebc9d5954fe3bb26bfbf5761d5bfdae6bb250