Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40db05e183ca710…

MALICIOUS

PDF

47.3 KB Created: 2020-03-06 15:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f30e245d48c2cd9564bb4b21bb1fe58 SHA-1: 553b684d56b91d81c0d908ba82ec7793486cb053 SHA-256: d40db05e183ca7103e2f6c5e3afcaae6ff2ace71a3caca8d2588dc89b6252f99
94 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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be directing users to a multitude of external sites, likely for SEO spam or to host further malicious 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://stillosophy.com/uploads/1/3/0/6/130639081/130639081.html#ocarina+of+time+biggoron+sword+guide
    • http://cleancirclellc.com/uploads/1/3/0/2/130287239/tadijid-ledup.pdf
    • http://hostmaster.pentacleclub.com/uploads/1/3/0/2/130289803/570733.pdf
    • http://www.hairsalonschicagoil.com/uploads/1/3/0/5/130542692/9856804.pdf
    • http://rbmusiq.com/uploads/1/3/0/6/130621035/muviparuruvorewi.pdf
    • http://theinsuranceguy.agency/uploads/1/3/0/6/130639275/c641046e99790.pdf
    • http://richmondtirerepair.com/uploads/1/3/0/5/130538816/gureraxibulowix.pdf
    • http://www.eyecandycollection.org/uploads/1/3/0/2/130274316/wexaxaxiv.pdf
    • http://terrapin-llc.com/uploads/1/3/0/4/130476587/gajafu_vubupi_mifevomulefap_tawetinaza.pdf
    • http://www.philmlandshowcase.com/uploads/1/3/0/7/130739088/wixepobirijaze_paxepona.pdf
    • http://realmandrake.com/uploads/1/3/0/4/130483096/32a0587101250a0.pdf
    • http://anahyattmovementcom.com/uploads/1/3/0/5/130544703/kosidegojineli_kesekuriligi_siloxademegita_kuwogabolajijaj.pdf
    • http://aultshypnotherapyandmassage.services/uploads/1/3/0/7/130776754/7835613738f32c.pdf
    • http://mswilliamsonline.com/uploads/1/3/0/6/130603834/pegutimomolabul.pdf
    • http://3mtruedefinition.com/uploads/1/3/0/5/130540504/rufojifabadel_sekiwev_fesil.pdf
    • http://callumworsnop.com/uploads/1/3/0/6/130620542/4038179.pdf
    • http://oandpideas.com/uploads/1/3/0/7/130776102/362acca3d1.pdf
    • http://poolguyzenmaster.com/uploads/1/3/0/6/130620228/8149298.pdf
    • http://youngmenofrespect.org/uploads/1/3/0/7/130776866/1840623.pdf
    • http://creativedigitalpen.com/uploads/1/3/0/3/130313741/12d983d9759.pdf
    • http://www.guyellisphotography.com/uploads/1/3/0/2/130289288/56ac2c.pdf
    • http://completecoveragefootball.com/uploads/1/3/0/4/130476048/a0e522274834f.pdf
    • http://texasbackhaul.com/uploads/1/3/0/5/130550931/4783729.pdf
    • http://nohervadi.net/uploads/1/3/0/6/130621061/136459.pdf
    • http://www.amglasswork.com/uploads/1/3/0/2/130288412/butuzebawoxezovevu.pdf
    • http://nohervadi.net/uploads/1
    • 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_off00008801.bin
448978321f56806493ba944b3d9ce47e9b7dab66ae4872139fd17fc20aef8bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 7452 bytes
font_01_sfnt_off0000a548.bin
480437884ac0b6d9fcc812d03c56ed28f568666de2b30b44bd42ac9599fc2464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA548 2680 bytes

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