Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57deb13fcbdfff…

MALICIOUS

PDF

41.9 KB Created: 2020-03-28 10:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b61d7afea6b03a3e4c039301077c516 SHA-1: ca49d8270f6d93cd8edefecd1b6961dab2346b04 SHA-256: af57deb13fcbdfff324da184b7041fc062a2819c797331b045c5f3bfae6c0b3c
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Conclusion sobre investigacion cualitativa y cuantitativa' and references the wkhtmltopdf tool, suggesting it might be a generated document. The primary attack pattern involves directing users to numerous external PDF files hosted across various domains, likely for SEO spam or to distribute malware. No scripts were extracted, and the maliciousness is inferred from the link farm behavior.

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://johnymoore.com/uploads/1/3/1/4/131437567/131437567.html#conclusion+sobre+investigacion+cualitativa+y+cuantitativa
    • http://dbfoodsllc.com/uploads/1/3/0/3/130323642/vajikenun.pdf
    • http://lipworthy.com/uploads/1/3/0/9/130969946/4006409.pdf
    • http://www.amirosacreations.com/uploads/1/3/0/8/130814735/ziwozadanapifo-taboluf-soxiribesi.pdf
    • http://optikkorrect.com/uploads/1/3/0/2/130271111/26ede3.pdf
    • http://www.encounterbayplumbinggaselectrical.com/uploads/1/3/1/0/131070972/455468.pdf
    • http://amandaseddon.com/uploads/1/3/0/8/130874352/4ee4e9815.pdf
    • http://www.dashcamworkshop.com.au/uploads/1/3/0/6/130639461/lujivoti_kivalemu.pdf
    • http://soupbonerocks.net/uploads/1/3/0/5/130588779/2682158.pdf
    • http://mvnatmed.com/uploads/1/3/0/9/130969141/leziriro.pdf
    • http://aubriegroesbeck.com/uploads/1/3/0/8/130813055/2c8b5b810c.pdf
    • http://hawaiiwithchris.com/uploads/1/3/0/6/130620679/kezef.pdf
    • http://www.hermosahistory.com/uploads/1/3/0/5/130545097/2828dba.pdf
    • http://mta-sts.strutmaster.net/uploads/1/3/0/2/130288439/8452141.pdf
    • http://mail.howshehelps.com/uploads/1/3/0/2/130288731/tiwibifufumab.pdf
    • http://www.suncountrycarpetcare.com/uploads/1/3/0/2/130272352/7e09d32b34b4.pdf
    • http://anniemaegreen.com/uploads/1/3/0/4/130476699/jegokudede.pdf
    • http://74-123-78-212.mgwnet.com/uploads/1/3/0/6/130640214/runodivika-jifejisareju-venupidupewaro.pdf
    • http://haleydeckerphoto.com/uploads/1/3/0/4/130436068/megaxememurakabumo.pdf
    • http://flyingcrabcrap.com/uploads/1/3/0/4/130490808/vulolotoxag-pokef.pdf
    • http://mail.newparkgames.com/uploads/1/3/0/7/130775782/3737330.pdf
    • http://vicharahealth.com/uploads/1/3/0/6/130640162/556934.pdf
    • http://heikolight.com/uploads/1/3/1/0/131070723/24e3caa8c92.pdf
    • http://elisamurphyforjudge.com/uploads/1/3/0/4/130476161/vabalivopobofe_futarurul_zepepus.pdf
    • http://simonlloyd.ca/uploads/1/3/0/4/130435702/sazuxijur.pdf
    • http://exrepo.com/uploads/1/3/0/4/130477309/1818954.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a4.bin
81e9e61d8e24728e44b0feb34979bd0b32bd5cc5a7214b077af60ba6e6ac5dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A4 8436 bytes

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