Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf199394368c71d…

MALICIOUS

PDF

45.0 KB Created: 2020-05-19 00:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2512492528ce28c9b04ab128694bfc1a SHA-1: 916ea125ee8f04f76ab2fd5b060226e4f8bc180d SHA-256: 6cf199394368c71dcc9d2447cfd6d246267f97c05ec14874bfe607f578fa695b
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 PDF files. This technique is often used for SEO poisoning or to distribute malicious payloads. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to leverage external resources for malicious purposes.

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://rockandrowel.com/uploads/1/3/1/4/131453493/131453493.html#human+anatomy+and+physiology+printab
    • http://friendsofthenevadacountylibraries.org/uploads/1/3/0/5/130540296/8907191.pdf
    • http://adesartden.com/uploads/1/3/0/4/130488698/xifeminuwo.pdf
    • http://peggyformpe.com/uploads/1/3/1/3/131384142/modupezedapaduwu.pdf
    • http://williegoldfinchpublishing.com/uploads/1/3/0/4/130435500/d72acc61b7.pdf
    • http://lifetobedetermined.com/uploads/1/3/0/3/130313343/wanofemakawivibi.pdf
    • http://hkdesignstudioonline.com/uploads/1/3/1/4/131453031/mufodudizom.pdf
    • http://resolvera.org/uploads/1/3/0/9/130969798/nutupisig.pdf
    • http://rachelkanephotography.net/uploads/1/3/0/7/130775123/libiwejunizadol_kufezedojevosop_mimegiwi.pdf
    • http://xciteeducation.com/uploads/1/3/0/5/130540554/4251115.pdf
    • http://3consulting.net/uploads/1/3/0/4/130488101/wapakufoduvofikogi.pdf
    • http://universeoftoronto.com/uploads/1/3/1/1/131163904/7733917.pdf
    • http://mybountifulbaskets.com/uploads/1/3/0/5/130550824/sutiruvemumeju.pdf
    • http://waywardmomforlostsouls.com/uploads/1/3/0/7/130739695/5679096.pdf
    • http://cwdesigncenter.com/uploads/1/3/0/2/130272928/fc7219bb5.pdf
    • http://varjufamily.com/uploads/1/3/1/6/131606011/newapumed_kodesegodumego.pdf
    • http://pimentelconsultoria.com/uploads/1/3/1/4/131438888/masopunab.pdf
    • http://sultanalthani.com/uploads/1/3/0/8/130814286/xudegul-midini.pdf
    • http://d-cyfor.com/uploads/1/3/0/4/130476669/6313675.pdf
    • http://artseverlasting.com/uploads/1/3/0/4/130476912/214a5.pdf
    • http://betsyrossproperties.net/uploads/1/3/0/4/130489230/f82cd.pdf
    • http://serinity.fr/uploads/1/3/0/3/130313241/78750bbdaa307.pdf
    • http://resourcecarewellness.com/uploads/1/3/1/8/131856224/2472483.pdf
    • http://fightingplastic.org/uploads/1/3/0/6/130605430/a7616bace34.pdf
    • http://topdollartextbooks.com/uploads/1/3/0/2/130292173/puriza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000846a.bin
90d2315bc1e4d0113e18355348b5078f7f154e2fe4e9310149cb5d6ae5ba6482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846A 10316 bytes

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