Malicious PDF — malware analysis report

Static analysis result for SHA-256 557d3140e171e0a2…

MALICIOUS

PDF

41.4 KB Created: 2020-03-10 02:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 80365a59f75c7435734c5c9f9177a6f0 SHA-1: 1a0d78cdc1e525957d85fa6560fa31608a3d3b96 SHA-256: 557d3140e171e0a26b7d5538352a15b4cc3b16ae3724efd6f50484a852f63f2c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to external PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malware or phish for information. The heuristic 'PDF_SEO_LINK_FARM' strongly supports this assessment, identifying a mass of external links. No scripts were extracted from this sample, limiting the ability to determine further payload delivery or execution mechanisms.

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://buyorsellyours.com/uploads/1/3/0/5/130589431/130589431.html#oq+%C3%A9+hemicrania+parox%C3%ADstica PDF link annotation
    • http://psyneways.com/uploads/1/3/0/7/130739076/9460974.pdfIn PDF document text
    • http://dannyb123.com/uploads/1/3/0/2/130288722/ddc7f6a02fc.pdfIn PDF document text
    • http://www.comic-card-creation.com/uploads/1/3/0/6/130621148/maxufajit.pdfIn PDF document text
    • http://octorock.net/uploads/1/3/0/6/130621511/5842016.pdfIn PDF document text
    • http://hampersngiftsby5ms.com/uploads/1/3/0/4/130476866/295b79e98e4bd.pdfIn PDF document text
    • http://bamestate.com/uploads/1/3/0/5/130540789/zewot_xikipiva.pdfIn PDF document text
    • http://getshowee.com/uploads/1/3/0/5/130543059/ziregunerur.pdfIn PDF document text
    • http://georgesweetland.com/uploads/1/3/0/7/130775361/322dbd969f44.pdfIn PDF document text
    • http://peakscentre.com/uploads/1/3/0/6/130604756/faxus.pdfIn PDF document text
    • http://midshiftmedia.com/uploads/1/3/0/7/130776247/modorupijolis.pdfIn PDF document text
    • http://playinaustin.com/uploads/1/3/0/8/130874102/zenebomafalu.pdfIn PDF document text
    • http://caskmutation.org/uploads/1/3/0/6/130621608/sovisota.pdfIn PDF document text
    • http://ezatransportation.com/uploads/1/3/0/3/130323697/kodugovawukibovujiro.pdfIn PDF document text
    • http://ns1.carasoul.com/uploads/1/3/0/8/130874088/410673a4c9892a8.pdfIn PDF document text
    • http://www.texasstarlighttech.com/uploads/1/3/0/2/130289353/marutuxikowed_dewewenurenake_xegomumebupo.pdfIn PDF document text
    • http://aclimited.org/uploads/1/3/0/7/130775268/3936728.pdfIn PDF document text
    • http://gemsjewelryappraisalservice.com/uploads/1/3/0/9/130969938/77509.pdfIn PDF document text
    • http://quickbuydevices.com/uploads/1/3/0/7/130775171/pojigefivesaz.pdfIn PDF document text
    • http://valleycharterhighschool.com/uploads/1/3/0/6/130604625/zelav_mojek_ziziwejab.pdfIn PDF document text
    • http://oslorelocation.net/uploads/1/3/0/6/130620356/mininoniwi-mojaj-jigifojapi.pdfIn PDF document text
    • http://sud-zlaundry.com/uploads/1/3/0/5/130550760/vepujopafizuvikafap.pdfIn PDF document text
    • http://katypoolservice.net/uploads/1/3/0/5/130550805/rurixilusejenaseweg.pdfIn 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

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7736 7984 bytes
SHA-256: 818ef1e5397d82399f6ea20f1571451c1a20d61736a25e1780c1eb6cdd3a13fa

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