Malicious PDF — malware analysis report

Static analysis result for SHA-256 626b711d46a1bb25…

MALICIOUS

PDF

41.2 KB Created: 2020-03-08 06:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 166eab3389f89206b9975ee971029ed9 SHA-1: e90e216a2712b043f1a5eb5bf7f2083314e7be12 SHA-256: 626b711d46a1bb25504436e002e5ddfd9a4d3dcd5d010c5cb7a9608b931d5197
136 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host malicious content or distribute further malware. The ML classifier strongly flagged this sample as malicious, supporting the assessment of a malicious intent.

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://directroofrestoration.com/uploads/1/3/0/2/130289426/130289426.html#how+to+reduce+swelling+after+achilles+surgery
    • http://alignwellnesscare.com/uploads/1/3/0/6/130621727/2053643.pdf
    • http://renebouwman.nl/uploads/1/3/0/5/130588477/ravaz.pdf
    • http://ritterschild.medievalknightshields.com/uploads/1/3/0/2/130287977/nefaworiv-jiros.pdf
    • http://tmjcenterhawaii.com/uploads/1/3/0/2/130287314/5281538.pdf
    • http://shelfstalker.net/uploads/1/3/0/8/130815097/899cc234.pdf
    • http://gofindthefernie.com/uploads/1/3/0/2/130289339/xoxene_towuj_fexokazubepixa_xubiwatinegojer.pdf
    • http://www.solarenergybrokerinc.com/uploads/1/3/0/7/130775647/3b9784943.pdf
    • http://concordantcapitalpropertymanagement.com/uploads/1/3/0/9/130969854/nugokimesosur-borafupuwu-kobopexepi.pdf
    • http://rhnyctssrv1.raffertyholdings.com/uploads/1/3/0/4/130476575/1448331.pdf
    • http://bradgoodsontutoring.com/uploads/1/3/0/8/130814754/3305890.pdf
    • http://tgvarik.net/uploads/1/3/0/2/130288416/zakilaboba.pdf
    • http://www.martimmo.com/uploads/1/3/0/2/130289558/e8d0aaf.pdf
    • http://aryadnamusic.net/uploads/1/3/0/6/130621868/kexuzemowezig.pdf
    • http://kidsforchristclub.com/uploads/1/3/0/8/130874292/3125ab73746c1.pdf
    • http://www.thelocalfoodkitchen.co.nz/uploads/1/3/0/8/130813497/1b6d7368.pdf
    • http://walkoffstudios.com/uploads/1/3/0/6/130620460/5486307.pdf
    • http://splinteredmindshirts.com/uploads/1/3/0/7/130738785/6cf1e.pdf
    • http://thatgirlmathy.com/uploads/1/3/0/6/130622116/9406171.pdf
    • http://amommachoosingjoy.com/uploads/1/3/0/7/130775784/mugigadux-kotelaga-jifojanuvuxaruk-lixuroxanoz.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007778.bin
5fc4ceec9b35efe8e806f6115d6a2d1b07d24a31ae5ee4fc2d3848234f018ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7778 8372 bytes

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