Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7f820f3430c882…

MALICIOUS

PDF

36.4 KB Created: 2020-03-18 11:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a7a37e133a5777fbf848282ecedc358a SHA-1: d5fb3bba264f52a1494c3f08f570c852d17c56a9 SHA-256: 4b7f820f3430c8821e8bc2ab8d78f557db1aa854b3de99f3af289c741b001833
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The presence of the SE_LOLBIN_RUN_COMMAND heuristic indicates that the document may contain instructions to execute system commands, likely to facilitate further malicious activity. The document body itself contains garbled text but includes URLs that are also listed in the extracted URLs, reinforcing the link farm observation.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://digitaldocmd.com/uploads/1/3/0/5/130550858/130550858.html#problemas+resueltos+de+transformadores+monofasicos+pdf PDF link annotation
    • http://xsaia.org/uploads/1/3/0/7/130775084/2513959.pdfIn PDF document text
    • http://jezebelslingerie.com/uploads/1/3/0/5/130589122/8852481.pdfIn PDF document text
    • http://www.taketheridewithmaureen.com/uploads/1/3/0/5/130538870/watalo.pdfIn PDF document text
    • http://virtualrealitycapture.com/uploads/1/3/0/3/130312991/rivobosizigesaj.pdfIn PDF document text
    • http://giant-hearts.com/uploads/1/3/0/3/130323672/wanevixox_kifanenamapabi_fabisaka.pdfIn PDF document text
    • http://dx.americanbusinessmachines.net/uploads/1/3/0/5/130540397/1504438.pdfIn PDF document text
    • http://jacksgrilltempleton.com/uploads/1/3/0/6/130604386/vowuweduda-bedipuniwobi-gojakiw-buvubalitida.pdfIn PDF document text
    • http://eenews.com/uploads/1/3/0/6/130620678/191b412.pdfIn PDF document text
    • http://liquorlawsvt.net/uploads/1/3/0/6/130621278/mebomujaraki-tekiwubogew-milotowafake-zexemekil.pdfIn PDF document text
    • http://webmail.groundedplantandfloral.com/uploads/1/3/1/0/131071125/3980759.pdfIn PDF document text
    • http://natgastrucks.com/uploads/1/3/0/8/130813859/47d685f7dd28fb.pdfIn PDF document text
    • http://www.empireofthemoors.com/uploads/1/3/0/6/130639143/dumemel_tujijumoxemave_sifanibisara_raroziniras.pdfIn PDF document text
    • http://thewhitepartnership.com/uploads/1/3/0/3/130313588/ketig.pdfIn PDF document text
    • http://myfaraja.com/uploads/1/3/0/6/130604604/796883.pdfIn PDF document text
    • http://skipstonelearning.com/uploads/1/3/0/7/130775694/3013383.pdfIn PDF document text
    • http://webdisk.entertain.hk/uploads/1/3/0/6/130603976/jisog.pdfIn PDF document text
    • http://chipinc.org/uploads/1/3/0/5/130544226/9235322.pdfIn PDF document text
    • http://butwheredoyougetyourprotein.com/uploads/1/3/0/5/130588703/jogavupeme-pimumu-sofunam-miwafazirotov.pdfIn PDF document text
    • http://liveultimatelife.com/uploads/1/3/0/4/130483725/bogipaboniponavowu.pdfIn PDF document text
    • http://www.zulassungsdienst.net/uploads/1/3/0/5/130588989/4208504.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

Related samples 4

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_off000067e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 7392 bytes
SHA-256: d28d37914cf6b19dad9719a2f7faf2bf01242459e6e5d9b29b4017d751ac036c

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