Malicious PDF — malware analysis report

Static analysis result for SHA-256 a678967f536b5152…

MALICIOUS

PDF

41.8 KB Created: 2020-06-12 05:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 955507de9adbfb151d16f595dcf2ec2c SHA-1: b3d82ed31856504cb47b545b024e758cb51005bf SHA-256: a678967f536b5152e3751a2e9ada3344907aa17ea152e847e67985dac17521e8
104 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'lesson plans'. The presence of a 'PDF_SEO_LINK_FARM' heuristic firing indicates a deliberate attempt to create a link farm, likely to distribute malware or phish for credentials. No scripts were extracted from this sample.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theroibot.com/uploads/1/3/0/8/130874278/130874278.html#lesson+plans+for+that+was+then+this+is+now PDF link annotation
    • http://laciepricedesign.com/uploads/1/3/1/0/131071289/67a081aac1c.pdfIn PDF document text
    • http://74-123-72-20.mgwnet.com/uploads/1/3/1/6/131606592/bepimuriv-jowisifuvet-rifatizaxo-labagezena.pdfIn PDF document text
    • http://christineszinner.com/uploads/1/3/1/8/131871695/a979bb3.pdfIn PDF document text
    • http://healconsultation-dc.com/uploads/1/3/0/2/130289244/wuvama_tavavijozerumov_rivanan.pdfIn PDF document text
    • http://spacemeasuring.com/uploads/1/3/0/5/130538985/wawepatug.pdfIn PDF document text
    • http://thebrandonkeiffershow.net/uploads/1/3/0/8/130814009/2e66105d6ef82.pdfIn PDF document text
    • http://hairbydwoo.com/uploads/1/3/0/4/130488486/suvazuxur-pegira-bosijumipisit.pdfIn PDF document text
    • http://fashionrewind.info/uploads/1/3/0/7/130775558/1667159.pdfIn PDF document text
    • http://leaderwithpurpose.com/uploads/1/3/0/5/130590353/jawonixilivatewoj.pdfIn PDF document text
    • http://profeward.com/uploads/1/3/0/6/130640125/4bfc285a080b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://duvuzeso.files.wordpress.com/2020/06/3626419874.pdfIn PDF document text
    • https://kozaxijewob.files.wordpress.com/2020/06/xufosepixefubete.pdfIn PDF document text
    • https://tugujaza.files.wordpress.com/2020/06/62966312526.pdfIn PDF document text
    • https://kurugavot.files.wordpress.com/2020/06/73195334747.pdfIn PDF document text
    • https://bujoguzone.files.wordpress.com/2020/06/womusomamotogasipotekiles.pdfIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 10244 bytes
SHA-256: 465c2672b0f79884070e6cfe87557e7d19b1aa69c948cabf7f45ecaa2eff3630

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