Malicious PDF — malware analysis report

Static analysis result for SHA-256 4124524010cee31a…

MALICIOUS

PDF

38.1 KB Created: 2020-04-04 11:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 4382720986b97e31faa864e7ac634ff4 SHA-1: b7fecc89e1132719273e4a1c2a57be8e30167611 SHA-256: 4124524010cee31aa5130175210c865838deb8685fb8157d063abbd5ac71cae5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body contains a misleading title about a curable disease, likely intended to attract clicks. The primary heuristic indicates a PDF SEO link farm, with multiple external URLs pointing to similarly structured paths on various domains. The document's purpose appears to be directing users to these external sites, which may host further malicious content or phishing pages.

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://caesarsphiladelphia.com/uploads/1/3/0/5/130547999/130547999.html#leucemia+linfoc%C3%ADtica+aguda+es+curable PDF link annotation
    • http://farm-art.net/uploads/1/3/0/6/130639342/5243084.pdfIn PDF document text
    • http://cedarhost.com/uploads/1/3/0/5/130588278/156d10745be.pdfIn PDF document text
    • http://spellinsbee.com/uploads/1/3/1/4/131438477/sifisexoweb.pdfIn PDF document text
    • http://elitemaintenancellc.net/uploads/1/3/1/3/131379873/kojaziwofe_dexebike.pdfIn PDF document text
    • http://webmail.snowhillmd.gov/uploads/1/3/0/3/130323154/9869619.pdfIn PDF document text
    • http://lexartis.mx/uploads/1/3/1/0/131070204/5479820.pdfIn PDF document text
    • http://shaohuawu.com/uploads/1/3/0/5/130588951/tumabulefunanuni.pdfIn PDF document text
    • http://willowdalecrane.com/uploads/1/3/0/7/130776877/pixodigajezojor_vuzarogu.pdfIn PDF document text
    • http://ifonlychild.com/uploads/1/3/0/2/130291365/sefaruzidivuwu.pdfIn PDF document text
    • http://bourioanatoliesfilms.net/uploads/1/3/0/6/130639757/9969425.pdfIn PDF document text
    • http://buynaklaw.com/uploads/1/3/0/5/130539774/riwawixababa.pdfIn PDF document text
    • http://crystalcharlotteeaston.com/uploads/1/3/1/4/131483557/8092833.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 8704 bytes
SHA-256: ffcf4f49414addae78af23793f1814bbdb0ee59f97dc3cfbb552f91f5934cf95