Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d70882353ddb41…

MALICIOUS

PDF

171.6 KB Created: 2021-04-06 18:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a21d7e3ec8bfef42e122c39a0ea7c749 SHA-1: 0c10ba56febb5aee88a5cb72330359f8f7b76d29 SHA-256: 33d70882353ddb41bb0ebf3a9d4505f27baf937a0bb7eb1246895e096224fcd9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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://golowaki.ru/123?utm_term=sri+chaitanya+school+uniform+socks PDF link annotation
    • https://cdn.sqhk.co/jusulikipe/8hhghhj/66942347593.pdfIn PDF document text
    • http://zhk-rekord.info/how_to_get_a_toned_stomach_and_bigger_bumgis0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_601862455fc48.pdfIn PDF document text
    • https://pegufalijedosok.weebly.com/uploads/1/3/4/5/134589263/6145072.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/9d1b386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_6007e0c626266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_6035565a5388d.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/fhjhchj/download_free_music_ringtones_for_android_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/zetewexuve/hcap9ih/biropebilewazo.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/9731665.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/jVOifWo/lufepiwubetizo.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/lizenezerasanes.pdfIn PDF document text
    • http://yewes.fun/prayers_that_bring_healing_and_activate_blessings_john_eckhardtu0fqj.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/ZeijoCI/4003875619.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/iMidhaq/52927531275.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/zazewipix.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/donod.pdfIn PDF document text
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/1717003.pdfIn PDF document text
    • http://muldwych.com/43659789324iek9y.pdfIn PDF document text
    • http://detonic-ordina.website/golitanisebaxeruvavz1zzs.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/hoLgjC6/41963926373.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/iejc2jc/alienware_mouse_pad_led.pdfIn PDF document text
    • http://raisinshq.club/old_yeller_death_quote0a3pg.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/zanubupatasik-pojimubupetedi-mifetemofini.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/ODghN33/fidirufifu.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/4649693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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
font_00_sfnt_off00022cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CC8 5392 bytes
SHA-256: 259f136a5571afd8fe868920dc03e7eec4b1af1fbc33b876c35437e595662fec
font_01_sfnt_off00023efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EFD 4432 bytes
SHA-256: b246acf5833f15e938ba40aafce50e01556f528b8ad8c498d4f136ac6c268bc8
font_02_sfnt_off00024d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D2A 13736 bytes
SHA-256: 20b9882c7b66812ea19f14a4bcf88d226fefa3322b8959780af54c48ef61d06e
font_03_sfnt_off00027b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B36 16284 bytes
SHA-256: bd058003fae001d33616efd22ca2c9db6306c8c92e545b6a6b2b3e4517e03923
font_04_sfnt_off0002911e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2911E 2960 bytes
SHA-256: ed9e0622747fa20f7d1ef6c515602b95d90090d9d3c4811d320e32e79da56477