Malicious PDF — malware analysis report

Static analysis result for SHA-256 9135b317c7d9104b…

MALICIOUS

PDF

40.7 KB Created: 2020-04-02 10:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ab8bf70e84713cc34d8c810f5cc453a SHA-1: 76041d58709b9020ea23cea1ed7a89c5673e29dc SHA-256: 9135b317c7d9104b0687eb5e7bf6dbb64580216dcb815538700de07eae47044b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body content is largely obfuscated, but the presence of numerous external links is a strong indicator of 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://sanprado.net/uploads/1/3/0/3/130323322/130323322.html#interpreting+bar+graphs+worksheets+2nd+grade
    • http://twincerelyyoursfw.com/uploads/1/3/0/7/130776257/betirixixosadikorugu.pdf
    • http://chelsearootscafe.com/uploads/1/3/0/4/130489359/a20e76319.pdf
    • http://ivery.co/uploads/1/3/1/4/131409717/dipopum-soxaf-gimukisiv.pdf
    • http://cmnabe.org/uploads/1/3/0/9/130969419/78d8c4.pdf
    • http://motwh.org/uploads/1/3/1/3/131398574/368fe12.pdf
    • http://carolinebatson.com/uploads/1/3/0/8/130814286/a651c60da04b03.pdf
    • http://comicsandcognac.com/uploads/1/3/1/4/131438260/9444360.pdf
    • http://gbtproperties.com/uploads/1/3/0/7/130739686/ca709635dbff4d8.pdf
    • http://12poundsdown.com/uploads/1/3/0/5/130551294/kilinokasorugum-sezuz-jikazunodaraxu.pdf
    • http://dianebrowncolourspecialist.com/uploads/1/3/0/6/130639146/d0bb57f.pdf
    • http://korthorn.dk/uploads/1/3/0/8/130874101/3450612.pdf
    • http://vailplatinum.com/uploads/1/3/0/7/130776344/941968.pdf
    • http://jasminbrennan.com/uploads/1/3/0/6/130621307/9694783.pdf
    • http://animalloverscaninerescue.com/uploads/1/3/0/7/130738497/sunameluzivov-motonorud-mubunozozet.pdf
    • http://microbladingdenisadama.com/uploads/1/3/0/8/130874030/dowigivutuzosos_nopusutero_gitojutidode_xutako.pdf
    • http://judithjack.com/uploads/1/3/0/5/130546294/fovowubok.pdf
    • http://smokiesbeer.com/uploads/1/3/0/8/130813314/d854c9dbfe.pdf
    • http://wheeloflifegathering.com/uploads/1/3/0/3/130379319/jorefamupo_beridesabud.pdf
    • http://cablackwomendemclub.com/uploads/1/3/0/7/130776712/jivobevividov_tijipevavi_faluzigefugomif.pdf
    • http://pageantofthearts.org/uploads/1/3/0/3/130313053/wubogoro-minebewif-depokugi-dorovopeduwe.pdf
    • http://shopsitkalighthouse.com/uploads/1/3/0/6/130639837/cf4bfcb9882d2.pdf
    • http://networkingpeopleconsulting.com/uploads/1/3/1/4/131453177/tewaluzeg.pdf
    • http://comprasusashop.com/uploads/1/3/0/4/130476878/pixifojisu-watas-risewivera-segugo.pdf
    • http://firesidecornermv.com/uploads/1/3/0/5/130546283/faxototemabawekun.pdf
    • http://steidlelawfirm.com/uploads/1/3/0/6/130639379/3389117.pdf
    • http://comprasusashop.com/
    • 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_off0000767c.bin
a3b8d7fec8ecec42f27efd3a699ceff0fb8b2a67674d21a031ef7472a07f9f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767C 7656 bytes

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