Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0830058aece925…

MALICIOUS

PDF

71.2 KB Created: 2020-06-07 06:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ad8afebc0eb2dfef6b0ee6a9f32d83 SHA-1: 206861901ecd3b54c3c36a0e1d311808961a934e SHA-256: ee0830058aece9251fbe5a08903d158bad88ec715ebb7624f49d3f0876545ecc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable, but the extensive link farm points to a malicious intent, likely to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://infiniment.net/uploads/1/3/1/4/131452954/131452954.html#%25D8%25B5%25D9%2588%25D8%25B1+%2528%25D8%25B3%25D8%25AA%25D9%2588%25D8%25B1%25D9%2585%25D9%258A+%25D8%25AF%25D8%25A7%25D9%2586%25D9%258A%25D9%2584%25D8%25B2%2529+%25D8%25A7%25D9%2584%25D8%25AC%25D9%2586%25D8%25B3%25D9%258A%25D8%25A9
    • http://todayyearsold.co/uploads/1/3/0/4/130436181/lusilisewejira.pdf
    • http://donalddistrictone.com/uploads/1/3/1/8/131856715/882a2ac2e686f55.pdf
    • http://aaronmager.com/uploads/1/3/0/6/130620275/mifulunolavekokatoku.pdf
    • http://423.undesirable.us/uploads/1/3/0/3/130323884/9b8fc.pdf
    • http://hipthrusterbench.com/uploads/1/3/1/4/131407194/runipuzibugobo.pdf
    • http://divineelevation.net/uploads/1/3/0/6/130620921/sijejusasagiraz.pdf
    • http://symphonyno1.com/uploads/1/3/0/5/130551206/zarevojubalufo.pdf
    • http://achildsmindlearningthroughplay.com/uploads/1/3/0/5/130543166/modan.pdf
    • http://tuckettsfarm.com/uploads/1/3/0/5/130539170/e3635a86207d9.pdf
    • https://kavuwuri.files.wordpress.com/2020/06/durimipizowunekovipelik.pdf
    • https://wotilebuf.files.wordpress.com/2020/06/bipuzape.pdf
    • https://bomutap.files.wordpress.com/2020/06/nekefusor.pdf
    • https://ridedude.files.wordpress.com/2020/06/63320103501.pdf
    • https://sujapavalawu.files.wordpress.com/2020/06/pogarufisolirekixaku.pdf
    • https://womitoguv321508366.files.wordpress.com/2020/06/pekudotijukizabafadovana.pdf
    • https://busamonavek.files.wordpress.com/2020/06/rigefogenekosivapa.pdf
    • https://xidedikef.files.wordpress.com/2020/06/xusawe.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
stream_002_off0000ba4a.bin
9171b50c19585e5bfc3de39354174a46cedf717b32c8daf0c3f714dbaec6e138
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA4A 32048 bytes
font_01_sfnt_off0000f207.bin
f351b922a812b1dbd17f10fac3e34b805d74efed40a37baa1aae23108f4ada20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 8208 bytes