Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f88ebd1f26a461e…

MALICIOUS

PDF

83.1 KB Created: 2020-03-27 04:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 91e12063d26aa64453c42eff7afabaa3 SHA-1: 6b50381328cde74366a179fcd352374f84b91c3e SHA-256: 8f88ebd1f26a461eaac1357adb6c8bb885809786cddd79fe702e45ea39da4d4d
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The document body contains a URL that also points to one of these domains. This suggests the primary purpose is to redirect users to a network of potentially malicious or spam-related content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://morningpeople.club/uploads/1/3/0/4/130436415/130436415.html#formulas+de+identidades+trigonometricas+inversas PDF link annotation
    • http://quietspeculation.net/uploads/1/3/0/6/130604805/zadikijujisexuk.pdfIn PDF document text
    • http://citywidecontracting.net/uploads/1/3/0/8/130814673/jegitotijuxa.pdfIn PDF document text
    • http://borocreditrepair.com/uploads/1/3/0/5/130541803/vukosivot.pdfIn PDF document text
    • http://netspeedsolutions.com/uploads/1/3/0/7/130740082/0d93d115c2.pdfIn PDF document text
    • http://housecleaningsd.com/uploads/1/3/0/4/130483973/13e14d9560f67d.pdfIn PDF document text
    • http://premierbeachpropertymanagement.com/uploads/1/3/0/5/130543293/3339715.pdfIn PDF document text
    • http://ankhor.shop/uploads/1/3/0/8/130813696/4288839.pdfIn PDF document text
    • http://www.badcreditautoapprovals.com/uploads/1/3/0/9/130969632/c1986729c1.pdfIn PDF document text
    • http://orrerysystems.net/uploads/1/3/0/9/130969535/d3e26eee4f79.pdfIn PDF document text
    • http://www.williwisedaycamp.com/uploads/1/3/0/6/130621954/8085f37e462.pdfIn PDF document text
    • http://www.hffduluth.com/uploads/1/3/0/8/130873781/kenetewevitizel.pdfIn PDF document text
    • http://summerfield-education.org/uploads/1/3/0/7/130740443/pedodinirogurev.pdfIn PDF document text
    • http://cowichanopenlearning.com/uploads/1/3/0/8/130813108/8217367.pdfIn PDF document text
    • http://creekviewanglers.com/uploads/1/3/0/6/130621197/4456001.pdfIn PDF document text
    • http://pvpcombat.com/uploads/1/3/0/5/130542729/3117596.pdfIn PDF document text
    • http://505waterfordpark.com/uploads/1/3/0/7/130775797/vibopun.pdfIn PDF document text
    • http://blackgypsymamawagon.net/uploads/1/3/0/6/130639947/nuwuxemifabib.pdfIn PDF document text
    • http://smalldiningsets.net/uploads/1/3/0/6/130620263/mutufuv-dumawapemeli-vesopag-jakejokemenuz.pdfIn PDF document text
    • http://jeffwachner.com/uploads/1/3/0/2/130273788/limusofer.pdfIn PDF document text
    • http://www.sweguno.com/uploads/1/3/0/5/130588773/xoxige.pdfIn PDF document text
    • http://marculeroyal.com/uploads/1/3/0/5/130589230/618445.pdfIn PDF document text
    • http://gogrowaeroponics.com/uploads/1/3/0/6/130621509/vidurexo.pdfIn PDF document text
    • http://galiacombe.com/uploads/1/3/0/9/130969552/dipesugejifaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10180 bytes
SHA-256: 9cfb19df0b99eabd69afc69b0a5d1d811474e7429549db3b7b1977c743178f93
font_01_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 3836 bytes
SHA-256: becd19f91b6155827d7842d3060f9f94d9a941a6cfea49b24a00027c76c164d9
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16192 bytes
SHA-256: 3df1ce03d0f05102d0e902c06cc8cd1ef14d3249fbc68ceeac44c0580419eb3c

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