Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d23b2763bd6f132…

MALICIOUS

PDF

63.1 KB Created: 2020-04-18 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c55b2bae237490da590b738ef0046e3e SHA-1: 28ea814da8e0c097a5e5070048783d83180d14e6 SHA-256: 5d23b2763bd6f1329f3d054dce8d2d6b5327b2bf02b624408e2b428a1f6588d5
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. The embedded document body also contains a URL pointing to a collection of PDFs. This suggests the primary purpose is to redirect users to a network of linked documents, likely for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, but the structure implies a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • 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.
  • 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://nabena.com/uploads/1/3/0/2/130288883/130288883.html#bleacher+report+epl+predictions+week+24 PDF link annotation
    • http://firematicfireandsafety.com/uploads/1/3/1/4/131452839/muxapetolof.pdfIn PDF document text
    • http://newbreedzgenerationz.com/uploads/1/3/0/2/130289409/munezarupilevixiviw.pdfIn PDF document text
    • http://tcuroxo.com/uploads/1/3/0/4/130435588/6e18a4.pdfIn PDF document text
    • http://bonjourmktg.com/uploads/1/3/0/6/130620529/turikabodaf.pdfIn PDF document text
    • http://somewhere2turn.com/uploads/1/3/0/7/130776587/mekilumutexef.pdfIn PDF document text
    • http://thistlesandthorns.net/uploads/1/3/0/2/130289410/xesuno.pdfIn PDF document text
    • http://fromfarmandforest.com/uploads/1/3/0/4/130478470/lokanavujejufatuwi.pdfIn PDF document text
    • http://livebetter-livehealthy.com/uploads/1/3/0/9/130969972/rumore_bamigajibek.pdfIn PDF document text
    • http://movingthroughboundaries.com/uploads/1/3/1/4/131406281/nijelijo.pdfIn PDF document text
    • https://t.TuesdayIn PDF document text
    • https://t.m.co/fJzpAtreOQAgainstIn 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
    • http://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn 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 2

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F9 9456 bytes
SHA-256: d1ab0ba68b2b14fb704d37459be07b3c2e64a4b4db40782d11f579abe216d652
font_01_sfnt_off0000b53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 4516 bytes
SHA-256: e9a0f6df8889d3ded4f387df96b03817592447eda4ca74a6a7c43e7fce99310c
font_02_sfnt_off0000c3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A5 2856 bytes
SHA-256: 6f13902c56231375baabd7d7a9d552d75f195749e16f985683da6610eceab72e
font_03_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 4148 bytes
SHA-256: e2565d3055a991465e1669e4d43f23ae90b3c5bc6ac07a4688d95e82e0abb8a1
font_04_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16264 bytes
SHA-256: d50f37cc7c4b08482a007a8fd8464ecd7b06873666d3f6d7018f7454e9241001

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