Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e4387ffe6f502c…

MALICIOUS

PDF

37.5 KB Created: 2020-03-28 06:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7b20392044ed81796f91a355e3db423 SHA-1: aa450a009a8412a6cff0b50f97ec7c8b2f8ea8cd SHA-256: 86e4387ffe6f502c4ec48683de03a8c0434f2ba5f20b2f90d1f32b2b5d2165cd
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains, indicative of a link farm. The document body mentions 'Hp deskjet f4480 driver download', suggesting a lure to trick users into downloading files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized PDF links further supports a malicious intent to distribute harmful content.

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://purerockcolours.eu/uploads/1/3/0/4/130488197/130488197.html#hp+deskjet+f4480+driver+download
    • http://enlightentutoring.com/uploads/1/3/0/7/130738720/8548914.pdf
    • http://thedatingcircuit.com/uploads/1/3/0/6/130604230/rolumuwafujurimobi.pdf
    • http://huoli1.com/uploads/1/3/1/0/131070375/xupesutowogabon.pdf
    • http://pof-updatecall.com/uploads/1/3/0/6/130605433/rasabuwa.pdf
    • http://mybrokersells.net/uploads/1/3/0/7/130776272/tizewuleporip-tokegawowoban-bexewozaxeja-matatukigo.pdf
    • http://viverbemcomdiabetes.com/uploads/1/3/0/6/130604081/wewuvixe_nosat_bumerav_wikowe.pdf
    • http://realcurbappealinc.com/uploads/1/3/0/5/130544725/vegusagovenep-fudovegag-wipugofije.pdf
    • http://www.trimmerhead.co.nz/uploads/1/3/0/2/130273843/befofap.pdf
    • http://kidsart.studio/uploads/1/3/0/4/130435680/dasugowaxoloden_mizigimito.pdf
    • http://tiptopteacher.com.au/uploads/1/3/0/2/130287239/sitofem.pdf
    • http://facconstructiongroupllc.com/uploads/1/3/0/3/130323596/6554709.pdf
    • http://saalaw.org/uploads/1/3/0/5/130543019/vuvub.pdf
    • http://www.malmooregolf.org/uploads/1/3/0/2/130270894/mubekofimamemizog.pdf
    • http://www.2timothyclothing.com/uploads/1/3/0/7/130775341/fojerinopaxumek-jegasusanur.pdf
    • http://michaelamacpherson.com/uploads/1/3/0/5/130539129/2762133.pdf
    • http://smithandbeauty.com/uploads/1/3/0/7/130776601/gakojibogezewu.pdf
    • http://rockhillpestpros.com/uploads/1/3/0/6/130639222/9381002.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_off000067fa.bin
8c2d1a4ba01d0aeb195510176f362e73f923739e305e12ef1756105d747e1fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 8532 bytes

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