Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaf60dc80dac6f3…

MALICIOUS

PDF

32.3 KB Created: 2020-05-16 05:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea42122b353d0d56bb0bf69cf7ec015 SHA-1: 3fde9207ab7b809852a33425863c7cda21cc6319 SHA-256: 5aaf60dc80dac6f3e94712adafb86c3545b768623d20099f6b9eb59dba8647d2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The document body, though partially corrupted, contains text related to accounting questions and includes URLs that are part of this link farm. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://yourluckycharms.com/uploads/1/3/0/7/130740376/130740376.html#basic+accounting+questions+mcqs+with+answers+pdf
    • http://rumohr.org/uploads/1/3/0/5/130590322/livebu.pdf
    • http://xxpressyourselfteesandmore.com/uploads/1/3/0/7/130740489/dapazuraturefe_nawoxezizu.pdf
    • http://mferconnections.net/uploads/1/3/0/5/130551418/fefodamip-vawadejele.pdf
    • http://wafflemeup.com/uploads/1/3/1/3/131380618/0bb25.pdf
    • http://sarahminarik.info/uploads/1/3/1/3/131379420/xupemanane.pdf
    • http://trindoit.com/uploads/1/3/1/4/131483584/pujaditibiwub.pdf
    • http://humanstudio.org/uploads/1/3/0/7/130776407/4560877.pdf
    • http://tjonesjewels.com/uploads/1/3/0/6/130604653/nebubemapa-zaxowawekidu.pdf
    • http://homealarmhawaii.net/uploads/1/3/0/5/130590092/motuno.pdf
    • http://tiffanyeisner.com/uploads/1/3/1/4/131453136/fodisa-paxasu.pdf
    • http://childrenofthebomb.com/uploads/1/3/1/4/131406438/tidupobudes_zegadibivibaz.pdf
    • http://goodgerpinkproductions.com/uploads/1/3/0/6/130605174/ralakipenatiteb_muxifebekove_likesotig_rifotolit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000529a.bin
8590c62eb233c9b603490d1d5da670313c4dc560dc3fdbbfe666ebdb71b3aa83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x529A 10260 bytes

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