Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eea9fa18cebf738…

MALICIOUS

PDF

44.2 KB Created: 2020-03-29 07:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfa0edcdde6a7c5447c9ffc0d88ad907 SHA-1: 5d9b7821bd042d43cfe53f972bdf691eeb0587d7 SHA-256: 5eea9fa18cebf738701bd5f166d39ab9c585b8b778f684c427ccffca9393919f
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted across various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous generated URLs supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to a network of potentially malicious or spam-related content.

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://yinghuangwangshangyule.br3h.com/uploads/1/3/0/6/130620751/130620751.html#diapositivas+para+presentar+un+proyecto+de+investigacion
    • http://discerningheartsministry.org/uploads/1/3/0/7/130739324/zufijivuvize_meniluv_goregora_baxetunin.pdf
    • http://siouxfallsbirth.com/uploads/1/3/1/4/131438571/faduruvenulil.pdf
    • http://snorkelkoolina.com/uploads/1/3/0/7/130738797/92b116649e92c3.pdf
    • http://www.civillifer.com/uploads/1/3/0/6/130604525/lozosuna-kafudew-lanajazivorut.pdf
    • http://adacalifornia.com/uploads/1/3/0/6/130621071/9eabd.pdf
    • http://atlanticcity-bachelorparty.com/uploads/1/3/0/6/130604939/6230617.pdf
    • http://stephanieboivin.com/uploads/1/3/0/2/130272488/nipuzijej-ritabukuxob-bobisotakuf-temun.pdf
    • http://itsmrjack.com/uploads/1/3/0/5/130589317/1072472.pdf
    • http://plascovil.com/uploads/1/3/0/7/130775116/6025561.pdf
    • http://tracemex.com/uploads/1/3/0/7/130776401/wesogefevagogol-ketuj.pdf
    • http://microsoftehelp.com/uploads/1/3/0/6/130620437/5166532.pdf
    • http://knowledgesculpturewave.com/uploads/1/3/0/7/130776130/1e30d9d6479e8.pdf
    • http://inaccuratehistory.com/uploads/1/3/0/3/130379902/wotuk.pdf
    • http://churchoftheredeemed.net/uploads/1/3/0/9/130969241/63bb4786.pdf
    • http://wildlittlemonkeys-sl.com/uploads/1/3/0/6/130640231/16617.pdf
    • http://www.nhappyandbeautifulstore.com/uploads/1/3/0/8/130874455/2087801.pdf
    • http://bethsaidaruizdivinematrixcoaching.com/uploads/1/3/1/1/131164039/3056871.pdf
    • http://natureswayhealingmn.org/uploads/1/3/0/7/130740323/rexiladomulavalaxa.pdf
    • http://freeparadeofhomes.com/uploads/1/3/0/4/130488543/dakabirisedim.pdf
    • http://somosbienchula.com/uploads/1/3/0/6/130604682/ritivegob-zuver-laxemoxamudaf.pdf
    • http://wayjayjetwas.com/uploads/1/3/0/2/130287939/8658d41cd6dbc8d.pdf
    • http://maxmotorworks.com/uploads/1/3/0/9/130969820/9071409.pdf
    • http://countrysuitesatwykehamrise.com/uploads/1/3/0/3/130312924/libakowuvifefeju.pdf
    • http://prismautodetail.com/uploads/1/3/0/7/130775842/melujovuvikit-muluxupim-sovalite.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_off0000806c.bin
fdb9c1431970acd560449eb5b6f92ef70a2aad80b6efa0716c2fe805d500259a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 8856 bytes

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