Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7f9250d0533c47…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0af6f2a255c3adc9e411f9ee39cf1bce SHA-1: 45cb1f18643fc6f64106a116b840e76c8b17e8d8 SHA-256: dd7f9250d0533c47312acbeac8230436cd2c0eb60c6a1972db4663031cd4a979
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/wix?keyword=bring+the+noise+bring+the+ruckus PDF link annotation
    • https://cdn.sqhk.co/rabovafom/hgdsihQ/2020_election_map_live_updates_fox_news.pdfIn PDF document text
    • https://cdn.sqhk.co/kotafuli/x9yjbOO/7395893189.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/dinebebakodaza-sikiz.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/xobewadajuf_raxot.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/linulukapi_zeliwatusux_munaviraxazu_wujiroj.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/5782276.pdfIn PDF document text
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/sodas-kewanisuwuzuw.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/pupegigelavabisaja.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/ji0cide/ninufu.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/0PtjeSN/awards_for_all_application_form_2019.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/vabetutika-gazaz-xunabi-wikon.pdfIn PDF document text
    • https://mipajadotafev.weebly.com/uploads/1/3/2/8/132814286/235812.pdfIn PDF document text
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/pupegajaw.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/pesanojegokawej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_5a0d84605cf04983b6da172596f57783.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_8fe308fabc2242da82eff826f669bb4b.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_406641aa5a7d44e2b753a9ffc0a08432.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_f492bb9201ac4a1384b350d06cad9bc8.pdf?index=trueIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_8024bd17fbd1406e8129c82edaa29a33.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_5ddc752f90e14deb8f091db004c6e5f3.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 4956 bytes
SHA-256: 5300c0f020c688a02155256219b5907061a08dfec363749b2776f883d83884cf
font_01_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 11144 bytes
SHA-256: c23eb1d5796aa56aedc4a26c59f6a2f5a6cf0c2f0d7056bc65c950cca96d20ea
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176