Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7579b51810f430…

MALICIOUS

PDF

36.5 KB Created: 2020-03-30 15:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6715015a4ac290f14bc5dbc5f71eb471 SHA-1: 73321902cdacb57cb18844776155cdf196e8d3c9 SHA-256: 6c7579b51810f430e0931c88f4dd840975ee787379b04588f26abe755eb8a4a3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDF files, indicating a link farm SEO strategy likely designed to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous suspicious URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://clucktruckportland.com/uploads/1/3/0/3/130323214/130323214.html#do+sostenido+flauta
    • http://g7ufp.com/uploads/1/3/0/6/130604934/3821705.pdf
    • http://breezybirds.com/uploads/1/3/0/4/130436439/sekexebotuzawot_xazatup.pdf
    • http://declareyourday.com/uploads/1/3/0/5/130544352/8fa9ea9c84bf76.pdf
    • http://v-pops.com/uploads/1/3/0/3/130323324/kulixibovab.pdf
    • http://catholicstogetherinleicester.com/uploads/1/3/0/2/130272557/konisi.pdf
    • http://themusicaffect.org/uploads/1/3/0/5/130543816/2564001.pdf
    • http://mygptravel.com/uploads/1/3/0/3/130313289/jemuro_nedasujid_donazovapiza_losumowi.pdf
    • http://anamplifiedlife.net/uploads/1/3/0/8/130814584/bururanikuzutuw_tizozizufaga_vupuzepe_xafutamet.pdf
    • http://opiekawdomuipodrozy.eu/uploads/1/3/1/0/131070560/10dc1d22ff84a2d.pdf
    • http://nagibahmed.com/uploads/1/3/0/4/130435939/4154023.pdf
    • http://skipthediploma.com/uploads/1/3/0/4/130476976/5487156.pdf
    • http://adventuresinimagination.com/uploads/1/3/1/3/131380493/buzijud_rixotufizo_pubarefowinuwu.pdf
    • http://cestagift.com/uploads/1/3/0/5/130550711/welizaboliw_nunosufejizutik_zizurix_riteledowivojo.pdf
    • http://modusmarketseurope.com/uploads/1/3/0/6/130621574/81f85.pdf
    • http://mochex.com/uploads/1/3/1/3/131380495/vezodikup_babuxu.pdf
    • http://cmheducationalconsulting.org/uploads/1/3/0/6/130604342/5824616.pdf
    • http://riverviewepc.com/uploads/1/3/0/3/130313854/kokikifirafuratopi.pdf
    • http://edesignsforyou.com/uploads/1/3/0/6/130621500/9963259.pdf
    • http://momandpopmotelsflorida.com/uploads/1/3/0/5/130545557/zozunugakisizulod.pdf
    • http://spiritofmassachusettsrestaurant.com/uploads/1/3/1/0/131071038/35182bd2f92e.pdf
    • http://livingpainfreepeople.com/uploads/1/3/0/7/130775965/2554859.pdf
    • http://iheartadventure.com.au/uploads/1/3/0/5/130588948/bivivusito_lorepodekonuvef_xuxosofipu_tuvodusegivup.pdf
    • http://thesexemporium.com/uploads/1/3/0/3/130323199/futuj_lagiwuwixavuri_vomagej_zasokumo.pdf
    • http://przewozosoblublin.pl/uploads/1/3/0/7/130740392/tawisasat.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666b.bin
100cf466b2109881c6b1edb57655d548d35c3ba973353a4e1f2e942899b7d054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 7732 bytes

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