Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c08980190acfac…

MALICIOUS

PDF

44.0 KB Created: 2020-04-08 13:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c82b31db4250e2e013af65130cb39b7 SHA-1: a8a60d574f45f6330dd9d7788384b065414e64ae SHA-256: b1c08980190acfac7b22c2aa9f65e803c872791ccbec4d438e7240423cc476ed
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to quotes and gratitude, likely serving as a lure. The primary intent appears to be directing users to these external sites, which could 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://peanutgalleryphotography14.com/uploads/1/3/0/6/130621641/130621641.html#aa+big+book+quotes+on+gratitude
    • http://creativelifesa.com/uploads/1/3/0/5/130541424/1559469.pdf
    • http://mslc.email/uploads/1/3/0/2/130289455/767c975.pdf
    • http://jay-photography.com/uploads/1/3/0/6/130620800/9a963d35.pdf
    • http://crescentwholehealth.com/uploads/1/3/0/5/130543991/84e0c1cb812.pdf
    • http://mynewobsessions.com/uploads/1/3/0/3/130323342/mijuvupekokobul.pdf
    • http://lindaslittletreasures.com/uploads/1/3/0/5/130544385/resavow.pdf
    • http://abbie-mae.com/uploads/1/3/0/7/130738751/sapubedize-fuvipe.pdf
    • http://congopapers.com/uploads/1/3/0/6/130622106/1391278688.pdf
    • http://unitedmotorcarcompany.com/uploads/1/3/0/5/130543190/sutemotipafer_venag_tapufeparex_risutiwoja.pdf
    • http://tarotlimburg.nl/uploads/1/3/0/4/130476183/vonowukuzu-sizorifajinata-lojomovawojepib-kiseve.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_off00007859.bin
c520e6191268fde4722847717e87994793c734e66af4a9004f2422d11b236150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 8200 bytes
font_01_sfnt_off00009813.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9813 2596 bytes

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