Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f6471ed633566…

MALICIOUS

PDF

56.8 KB Created: 2020-03-18 15:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e286e6ccf19ff9fe393c2cfc9a5c8c88 SHA-1: b6eca6081621bb3aab78684dacb73caf97b8f43a SHA-256: 776f6471ed633566bf9b6e49a8e6d216ea097f932e00e184041e7148c52f977e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous links to external PDF files hosted on various domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of generated URLs supports this assessment. The primary goal appears to be directing users to a network of potentially malicious or low-quality content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://designproinnovation.com/uploads/1/3/0/4/130489909/130489909.html#cuadro+comparativo+entre+todas+las+teor%C3%ADas+y+las+escuelas+de+la+administraci%C3%B3n
    • http://washitallcastillery.com/uploads/1/3/0/5/130588721/balagos-mebusonut-nonikemuweve.pdf
    • http://taylored.solutions/uploads/1/3/0/7/130776425/dufaxigofoda.pdf
    • http://sfchampions.com/uploads/1/3/0/5/130538866/b8314b9f5c4b8e0.pdf
    • http://seagroveinteriors.com/uploads/1/3/0/5/130589165/kalowokoxuxapor-lomebimit-dunowebadarowo.pdf
    • http://crazycraftcubby.com/uploads/1/3/0/6/130604685/6056108.pdf
    • http://strongherfasther.org/uploads/1/3/0/6/130620616/7b1e9be.pdf
    • http://www.ultimo-violin-teacher.com/uploads/1/3/0/5/130550814/nukeluwitifo.pdf
    • http://bluffcreekfarmsbedandbreakfast.com/uploads/1/3/0/5/130550750/sikif.pdf
    • http://www.ucgospelblog.com/uploads/1/3/0/7/130738871/6814145.pdf
    • http://bestmemoryfoamdogbeds.com/uploads/1/3/0/5/130551607/gadafugiluf.pdf
    • http://classicvirgo.com/uploads/1/3/0/5/130588649/latem.pdf
    • http://pampermesandrad.com/uploads/1/3/0/5/130550775/fegakikamufizig.pdf
    • http://allhottub.com/uploads/1/3/0/2/130289651/xofoz-ruveduloder-dagopekapej.pdf
    • http://arna.email/uploads/1/3/0/6/130621132/jiwukuwobi.pdf
    • http://scottfricker.com/uploads/1/3/0/2/130271038/suluvozufiluxeg-fiwuzi-bijevobofi.pdf
    • http://michelyngjurasic.com/uploads/1/3/0/5/130589103/53a9eed.pdf
    • http://gumpworld.com/uploads/1/3/0/6/130622104/3718061.pdf
    • http://californiaapprovedpipespecialist.com/uploads/1/3/0/7/130739945/c5029500dca02.pdf
    • http://kenzeesklozet.com/uploads/1/3/0/8/130814186/xoninijomovezawi.pdf
    • http://jaguartracks.com/uploads/1/3/0/5/130547728/duturakinumelon.pdf
    • http://veteranhillhops.com/uploads/1/3/0/4/130435746/xudaxex.pdf
    • http://mycompletecare.net/uploads/1/3/0/4/130483086/9516398.pdf
    • http://richardramos.net/uploads/1/3/0/6/130604423/makib.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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_off0000a8c6.bin
b095009e1aa7b679086a2dd093949a1e2bfdfa179c83d9e64a20210f199a406d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C6 1544 bytes
font_01_sfnt_off0000b036.bin
e20dabac5d9b705d95d9eda93bd80adc940a8526fdea4906c9a087a0fd598013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 9024 bytes

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