Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3834dddb8c6837a…

MALICIOUS

PDF

44.0 KB Created: 2020-04-02 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd8272923a1424a9280b10ac0f081be2 SHA-1: 8b64c89c246c8add13d9542b2c5cda2c4bd15327 SHA-256: d3834dddb8c6837a032e581ac9de48d86efd182c6b12db8abdf5b3326dec190c
94 Risk Score

Malware Insights

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

This PDF document exhibits a high confidence malicious classification due to the presence of a large number of external links, a technique often used for SEO poisoning or to direct users to malicious sites. The PDF_SEO_LINK_FARM heuristic specifically identifies this pattern, indicating the document's primary purpose is to host a farm of links. The embedded URLs, such as http://woodwardmagnet.org/uploads/1/3/0/9/130969618/130969618.html#download+boyfriend+number+2+sub+indo, are likely part of this malicious infrastructure designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://woodwardmagnet.org/uploads/1/3/0/9/130969618/130969618.html#download+boyfriend+number+2+sub+indo
    • http://sherimagery.org/uploads/1/3/0/5/130590438/4556357.pdf
    • http://webdisk.datrav.com/uploads/1/3/0/5/130546136/jufozu_wagofidanozitud_zanoxegofosif.pdf
    • http://myxlplyx.com/uploads/1/3/1/3/131379503/5662466.pdf
    • http://denadel.net/uploads/1/3/0/4/130488741/e141d0498.pdf
    • http://physiciandatasystems.net/uploads/1/3/0/6/130604581/917b50.pdf
    • http://lcosmetics.net/uploads/1/3/0/6/130604067/suxagifetewezo.pdf
    • http://festifbox.com/uploads/1/3/0/2/130272977/aeb3c6.pdf
    • http://nsideoutboutique.com/uploads/1/3/0/5/130588740/a32d33c.pdf
    • http://depthstiny.com/uploads/1/3/0/6/130639164/dixabiweni.pdf
    • http://inspiringwordsmiths.com/uploads/1/3/0/6/130604273/681682.pdf
    • http://playtennisbayarea.com/uploads/1/3/0/7/130739141/9058128.pdf
    • http://biodisasterlearningcenter.com/uploads/1/3/0/8/130814283/goxikebisirolu.pdf
    • http://myhappyhelper.org/uploads/1/3/0/4/130483540/wedagi-kivisubatojopo-xijezutegikegi.pdf
    • http://mediakit.mu/uploads/1/3/0/6/130604355/a31ac5e5f.pdf
    • http://risebuilders.net/uploads/1/3/0/3/130379096/bowoju.pdf
    • http://patosgatos.com/uploads/1/3/0/2/130289800/mixotoxapi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a92.bin
aed409df2d1504d57c4871494840d569f7c1709e60cb2cfbde96006365694ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 7952 bytes
font_01_sfnt_off00008963.bin
25c9b4cc848f7fe2bb391086046994af0a6cc27628bd24b3ce7aa399d36f844a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8963 7676 bytes