Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d174c498197dd6…

MALICIOUS

PDF

49.0 KB Created: 2020-03-21 18:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1012e9e72eb119425900ed6abbac4c97 SHA-1: ed287e4c511bbea5a6f5d1da89085b320091e267 SHA-256: b3d174c498197dd6fc7e2a7fbbb7e3d7b303da06b3524ba2c071bd5dd5e40ab4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm strategy. The primary heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is the intended function. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous URLs points to a redirection or content-hosting scheme.

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://stratford-hvac.com/uploads/1/3/0/7/130739105/130739105.html#homedics+foot+and+calf+massager+reviews
    • http://apsolutionsllc.net/uploads/1/3/0/6/130605403/junikilanamovek_zajopelodute_kejulid_merumuzog.pdf
    • http://www.moldzeroca.com/uploads/1/3/0/8/130813781/2276989.pdf
    • http://violingigs.com/uploads/1/3/0/8/130814187/9527260.pdf
    • http://readysetgrowpreschooldaycare.com/uploads/1/3/0/6/130621109/wamusibu.pdf
    • http://mx.arcancientaromatherapy.com/uploads/1/3/0/5/130588473/nerap_funolivi_xevadefixivuruf.pdf
    • http://vanperm.com/uploads/1/3/0/5/130550884/gatoxunevebofigonu.pdf
    • http://hightideproductions.net/uploads/1/3/0/6/130621409/xoxinixozosad.pdf
    • http://takebackministries.com/uploads/1/3/0/5/130543784/wexiwijokejebupa.pdf
    • http://aefitlife.com/uploads/1/3/0/6/130639071/1a4c3f0947f6.pdf
    • http://kathrynharper.org/uploads/1/3/0/2/130272462/wigujituloka.pdf
    • http://travelruscruise.com/uploads/1/3/0/4/130476579/tigodebekigu.pdf
    • http://benjaminthebookworm.com/uploads/1/3/0/6/130603835/5098891.pdf
    • http://albemarleop.com/uploads/1/3/0/5/130539072/2539203.pdf
    • http://oest.juniortalent.dk/uploads/1/3/0/4/130489143/tubutikajojaripi.pdf
    • http://causefunding.us/uploads/1/3/0/3/130313610/nemudodu.pdf
    • http://www.ukecigstorez.com/uploads/1/3/0/5/130590282/toputeri_rurawim_tipawokafipe_tofexifojuwip.pdf
    • http://beautifulhabits.net/uploads/1/3/0/5/130588867/6614863.pdf
    • http://accessmudjimbashores.com/uploads/1/3/0/6/130639263/48f22e8.pdf
    • http://bplogworldwide.net/uploads/1/3/0/6/130605168/reboximogoji.pdf
    • http://shinebrightsolarcleaning.com/uploads/1/3/0/5/130550764/gisenirevirose-fibazulijabi-dowadokatig.pdf
    • http://www.whyilovechapman.com/uploads/1/3/0/4/130476795/47aff6da29196c.pdf
    • http://ashleydholley.com/uploads/1/3/0/3/130323817/4445653.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_off00009539.bin
6729f8f6f5542d99fdb971c84eeb5b544ba009dbe2dc1af99a9c44f137ba93d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9539 8608 bytes

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