Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a918834e7ac8a…

MALICIOUS

PDF

42.8 KB Created: 2020-03-24 14:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6485cd9c4c7aa333bc8961df034c56a0 SHA-1: 90d8cbf9d692742e57595658f847f1713c335ba1 SHA-256: 756a918834e7ac8a06e754582ae58bdd1b9555bb3583e656bdb380d2795989fe
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, though partially corrupted, indicates a lure related to Excel formulas, directing users to external URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://nolimitsrunning.org/uploads/1/3/0/6/130621422/130621422.html#formula+for+calculating+percentage+change+in+excel
    • http://proteus-internetmarketing.com/uploads/1/3/0/5/130552073/6068831.pdf
    • http://www.asiarising.co.th/uploads/1/3/0/9/130968984/sesilajusutedex_gegarasebaxi_kipoziw_taradolobel.pdf
    • http://www.bobbranhamsales.com/uploads/1/3/0/4/130478433/2650248.pdf
    • http://www.glamorousthreadsboutique.com/uploads/1/3/0/3/130324004/154fdee.pdf
    • http://jacksonfwilliams.com/uploads/1/3/0/4/130436519/lejejov-tizakabak-talatoxido-xamisadukixa.pdf
    • http://dildrones.net/uploads/1/3/0/5/130588870/rexutim.pdf
    • http://illuminetix.net/uploads/1/3/0/6/130604885/zosimev.pdf
    • http://www.millerscloset.com/uploads/1/3/0/3/130323141/9b53a8.pdf
    • http://socaltbs2019.org/uploads/1/3/0/2/130289256/xaviravurisi_bizogozuvumuz_dotumiparomavin.pdf
    • http://jezebelslingerie.com/uploads/1/3/0/5/130589122/8852481.pdf
    • http://murdermysterysociety.com/uploads/1/3/0/6/130603930/vudixidoguw.pdf
    • http://lesslessmoremore.com/uploads/1/3/0/5/130588344/posibapeb_ropigejatofov_vexiwumo.pdf
    • http://apolloeducates.com/uploads/1/3/0/6/130640020/6149037.pdf
    • http://kahikateagardens.com/uploads/1/3/0/6/130621464/1432052.pdf
    • http://restorativejuveniledetention.org/uploads/1/3/0/7/130739401/rapowasakumapu.pdf
    • http://www.kvisualproductiononline.com/uploads/1/3/0/4/130476214/542a2e739.pdf
    • http://naka-g.creps-inc.jp/uploads/1/3/0/4/130478203/wuvewiboza.pdf
    • http://walkrunleap.com/uploads/1/3/0/4/130490488/jopikulusi-fesefati-dumetasa-sibotafo.pdf
    • http://deepspringdistillery.com/uploads/1/3/0/5/130588841/xemomelunogiwir.pdf
    • http://richmansburdenthefilm.com/uploads/1/3/0/5/130588747/dolajutosoluzoduj.pdf
    • http://co-opsourced.com/uploads/1/3/0/6/130604429/zebisamo_pugoxul_dififaris_sorenej.pdf
    • http://crestatlaurelwoodfinancing.com/uploads/1/3/0/7/130739816/4857132.pdf
    • http://brtennisexperience.com/uploads/1/3/0/4/130476130/pizurapitakigona.pdf
    • http://www.ganderviewoutfitters.com/uploads/1/3/0/6/130639860/zeluwo.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_off00007cb9.bin
84c4bbe4cf81673388d254d2e901ea988ff18fd858d1abb265e252e1798558b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB9 8412 bytes

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