Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f537c2b51c94382…

MALICIOUS

PDF

57.4 KB Created: 2020-03-18 14:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc0898579a20fe6632c7b852738ca61d SHA-1: e37bf6ec31f9fcbb774de64d33bb7844439262d6 SHA-256: 9f537c2b51c943828dec4e49b026cdb6fd4199445e30fc7de8b5e9930241cffd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely intended to manipulate search engine results or distribute further malicious content through the linked PDFs. No scripts were extracted from this sample.

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://inwardvision.com/uploads/1/3/0/4/130483045/130483045.html#palabras+con+cra+cro+cru
    • http://jthomrich.com/uploads/1/3/1/0/131070567/zexunosojiri.pdf
    • http://seatown.social/uploads/1/3/0/8/130874439/2703438.pdf
    • http://hostmaster.kristall-licht.at/uploads/1/3/0/5/130589337/6641642.pdf
    • http://jewelssjourney.com/uploads/1/3/0/4/130494801/dimanokivo.pdf
    • http://princejewelry.store/uploads/1/3/0/7/130776315/javanuxolaveru-xojekosixu.pdf
    • http://www.stephanietremblayart.com/uploads/1/3/0/8/130814179/dejogusaxasefus.pdf
    • http://countrykidstrading.com/uploads/1/3/0/7/130775265/jisite_gagoligokuga_pevoxupas.pdf
    • http://lcconsultingmanagement.com/uploads/1/3/0/6/130605204/zarika-mozovevukopofo-zozimed.pdf
    • http://sharonrosegabet.com/uploads/1/3/0/5/130588603/4d4b93ab11f.pdf
    • http://www.craftier-you.com/uploads/1/3/0/7/130740164/dokigudubomebebame.pdf
    • http://caymansonline.com/uploads/1/3/0/5/130550783/xisos.pdf
    • http://2325maurystreet.com/uploads/1/3/0/2/130289296/takimifitija.pdf
    • http://palmcourtathiddenriver.com/uploads/1/3/0/6/130604651/8312734.pdf
    • http://nwm6.club/uploads/1/3/0/2/130271015/4240379.pdf
    • http://munotcup.tvschaffhausen.ch/uploads/1/3/0/5/130588727/ff7bb08c.pdf
    • http://www.joyceanddonny.com/uploads/1/3/0/6/130639386/d74781f6e.pdf
    • http://implantsnewjersey.com/uploads/1/3/0/6/130621024/fatilamimowox-xebekunu.pdf
    • http://www.designthinkingspace.de/uploads/1/3/0/6/130639085/gamoti.pdf
    • http://flipfitmedia.com/uploads/1/3/0/3/130379096/rujumadujos_xikozidadejenix_jemazurezo.pdf
    • http://www.booztees.com/uploads/1/3/0/4/130483478/tigofin_retage_vanuforiputopur_jagis.pdf
    • http://thenintendoclubpodcast.com/uploads/1/3/0/5/130547069/bdaf49.pdf
    • http://hollyboggs.com/uploads/1/3/0/2/130270895/9ccbd0fe5ded.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a20d.bin
d04286b93a22cc8791560c1012abdb1b3b603d403e48b7d377bad670d5bef59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20D 8992 bytes
font_01_sfnt_off0000c2a1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16036 bytes

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