Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dfb24f178c430e…

MALICIOUS

PDF

45.1 KB Created: 2020-05-20 16:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f9119ac0418686e7045800c006f1049e SHA-1: 865054ca91657dfa896a372e4cc0ad0062c1723a SHA-256: 85dfb24f178c430ea6ad9718591ff85bf6014cc2a884ccf7c562b616422febe8
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDFs, indicating a link farm or SEO abuse tactic. The document body suggests a lure for an ebook, and the embedded URLs likely lead to malicious content or further redirection. The ML classifier strongly flagged this PDF as malicious.

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://baylandesign.net/uploads/1/3/1/8/131856170/131856170.html#where+is+my+boaz+ebook PDF link annotation
    • http://ozcameras.net/uploads/1/3/1/4/131482887/ad5e72485b.pdfIn PDF document text
    • http://menjivarswindowcleaning.com/uploads/1/3/0/5/130544001/tazew-natokuzix.pdfIn PDF document text
    • http://camerasandchocolatesphotography.com/uploads/1/3/0/5/130545742/kesivowitadabi-lumigejov-worasuwexotew.pdfIn PDF document text
    • http://tee2greengolfclub.com/uploads/1/3/0/3/130379173/e17808a0113f6.pdfIn PDF document text
    • http://thewallflowerwithwanderlust.com/uploads/1/3/0/5/130543976/dulivubadi-mukotojebolibo.pdfIn PDF document text
    • http://bassbarnstudios.com/uploads/1/3/0/4/130477074/jugifodomobufuzavi.pdfIn PDF document text
    • http://queencitycleaningcare.com/uploads/1/3/0/8/130813883/bimokafomopotim.pdfIn PDF document text
    • http://gelmerseeceuticals.net/uploads/1/3/0/6/130640199/lexipus-wineru.pdfIn PDF document text
    • http://alphabetearth.com/uploads/1/3/0/2/130274319/4596935.pdfIn PDF document text
    • http://boobysbeachshop.com/uploads/1/3/1/6/131636965/zukibo.pdfIn PDF document text
    • http://baycolorsrefinishing.com/uploads/1/3/0/7/130740200/928008.pdfIn PDF document text
    • http://artbyjulieh.com/uploads/1/3/1/3/131380803/858403.pdfIn PDF document text
    • http://easenetwork.org/uploads/1/3/0/6/130639949/7999415.pdfIn PDF document text
    • http://stacysdogtraining.com/uploads/1/3/0/2/130289558/9bdb8a.pdfIn PDF document text
    • http://aquaticmanagementsystems.com/uploads/1/3/0/4/130488946/3900972.pdfIn PDF document text
    • http://bjvdesign.com/uploads/1/3/0/7/130739022/vijanivuza_raxapurufisazut.pdfIn PDF document text
    • http://hitechtvmounting.com/uploads/1/3/0/7/130776602/sukilipe.pdfIn PDF document text
    • http://unipolgroupfitness.com/uploads/1/3/1/4/131453134/2b0a8501.pdfIn PDF document text
    • http://buycbdnow.ca/uploads/1/3/0/6/130605519/7164647.pdfIn PDF document text
    • http://romegatowing.com/uploads/1/3/1/8/131872037/76623e88dea7f6.pdfIn PDF document text
    • http://chiavevents.com/uploads/1/3/0/7/130738943/33f1c324e7.pdfIn PDF document text
    • http://mayriverelectric.com/uploads/1/3/0/2/130272348/tapogabugu-lorinaj-koxidivadato.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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738D 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000837e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 10696 bytes
SHA-256: 29e750eb39dfa95be5c8d1b02e242f771fd5db95631fdbc53c030c3cb5453647

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