Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11977625835880f…

MALICIOUS

PDF

62.2 KB Created: 2020-03-12 10:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 46925cde389df59739e45f08f09f8dfa SHA-1: f7296d9f9244ce04209a6e2c8596645a109408a9 SHA-256: b11977625835880fbd957da5785b38f601e80c1b4c74f7c0a86f6f724d31d920
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and a URL that mirrors one of the embedded links, further supporting the idea that the document's primary purpose is to redirect users to external content. No scripts were extracted, limiting the analysis of direct malicious execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.netherfieldinteriors.co.uk/uploads/1/3/0/5/130551222/130551222.html#generalized+epilepsy+with+febrile+seizures+plus+type+7 PDF link annotation
    • http://cup054.com/uploads/1/3/0/6/130620268/652b1c13.pdfIn PDF document text
    • http://improveyourvoice.net/uploads/1/3/0/7/130739705/23920014dc024.pdfIn PDF document text
    • http://dfsheetmusic.com/uploads/1/3/0/6/130620693/2287835.pdfIn PDF document text
    • http://www.emmak.co/uploads/1/3/0/4/130435791/kotavulagemaj_rigedugos_jozag_vatakinuvisi.pdfIn PDF document text
    • http://bronxlandlordattorney.com/uploads/1/3/0/4/130477448/490af55b.pdfIn PDF document text
    • http://tinkoff.vip/uploads/1/3/0/7/130775232/japurun_fudumunasosujak_feliletawezuw_tivuwafid.pdfIn PDF document text
    • http://backroadcreations.com/uploads/1/3/0/3/130379132/89087.pdfIn PDF document text
    • http://www.endlessspossibilities.com/uploads/1/3/0/6/130639888/radugilafitowip.pdfIn PDF document text
    • http://mineshaftgems.com/uploads/1/3/0/6/130620459/23fb90311204.pdfIn PDF document text
    • http://kadeskandies.org/uploads/1/3/0/3/130379463/gawigunufasu_jejoraxineg_milinowuwunis.pdfIn PDF document text
    • http://mylifewater.nl/uploads/1/3/0/7/130740444/c379122.pdfIn PDF document text
    • http://webmail.turningpointbc.org/uploads/1/3/0/6/130639877/vimeborokuvasad_rinufadawatekix_nivubezuto.pdfIn PDF document text
    • http://www.thesmokealarmguys.online/uploads/1/3/0/5/130539131/jinobitutiwu-xokosewa-nibewaguruju-tezoto.pdfIn PDF document text
    • http://www.thepottysquad.com/uploads/1/3/0/6/130640141/ed517df.pdfIn PDF document text
    • http://hostmaster.shillowbeer.com/uploads/1/3/0/2/130270763/543c3f9d0e56e.pdfIn PDF document text
    • http://nofbx.net/uploads/1/3/0/6/130620649/pefufat.pdfIn PDF document text
    • http://www.ping-technology.com/uploads/1/3/0/5/130540799/lodiwili.pdfIn PDF document text
    • http://www.seasprayclothing.com/uploads/1/3/0/4/130483402/vopuraxusif-zugerexafa-masemupuga.pdfIn PDF document text
    • http://japaneselanguageclassesbangalore.in/uploads/1/3/0/3/130323219/008a98f10c.pdfIn PDF document text
    • http://ravenmediaconsulting.com/uploads/1/3/0/5/130551049/a430cfaa73d77e.pdfIn PDF document text
    • http://thekashempire.com/uploads/1/3/0/5/130540401/5836906.pdfIn PDF document text
    • http://mouthdoctor.net/uploads/1/3/0/4/130436166/jewujikuku-xuwoxunomixozim-faxijesuvo.pdfIn PDF document text
    • http://precisionchassisworks.com/uploads/1/3/0/4/130488299/452346.pdfIn PDF document text
    • http://brokersue.com/uploads/1/3/0/7/130740008/3782963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 9048 bytes
SHA-256: f377831be9817c521339b4f1e978357ae019e62ded5652f522febe3bbc25e11c
font_01_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 3284 bytes
SHA-256: bff1374cd5d68ec7fef1c56a6dcb4130062e8e687cbddba7a1f3180d6a99bb89