Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c7c49f44581c27…

MALICIOUS

PDF

59.7 KB Created: 2020-04-12 06:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f7232d189b7ca47ecb7dcbea057ef49 SHA-1: feb7824837da95b4ff89170f51ce71b3425759bd SHA-256: f7c7c49f44581c2722f7f42b03ba70bcd3ccd91a622953b47bdbd785cbce41dd
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, many of which point to similarly structured URLs on different domains, indicating a link farm for SEO manipulation. The primary URL http://impact-active.com/uploads/1/3/0/6/130604363/130604363.html#nghe+nh%E1%BA%A1c+ch%C3%BA+%C4%91%E1%BA%A1i+bi+ti%E1%BA%BFng+vi%E1%BB%87t+mp3 is likely a lure to a malicious site. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://impact-active.com/uploads/1/3/0/6/130604363/130604363.html#nghe+nh%E1%BA%A1c+ch%C3%BA+%C4%91%E1%BA%A1i+bi+ti%E1%BA%BFng+vi%E1%BB%87t+mp3
    • http://missouriwhitewatercenter.com/uploads/1/3/1/4/131437530/bizatonav_jusiwakud_lalapapuz.pdf
    • http://allan69.com/uploads/1/3/0/6/130621865/8648852.pdf
    • http://residentialone.ca/uploads/1/3/0/2/130272649/98e05fc3051f70.pdf
    • http://iamfashionforever.com/uploads/1/3/0/5/130590143/28a0c6c.pdf
    • http://kckulture.com/uploads/1/3/0/8/130874540/lajuwowujuk_fofotufazibo_lobexabaru.pdf
    • http://flagscollection.net/uploads/1/3/0/5/130588870/xiwalezinelad.pdf
    • http://luchierebeauty.studio/uploads/1/3/0/9/130969862/1500937.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092f8.bin
6970d80b948821f478286bfffb91530f28509e9e3a05c518f6e251ee36e3cfac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 11044 bytes
font_01_sfnt_off0000b599.bin
9b39d2ce9e0129883b7351d9accfbbe09b91cbccdb27c95864f7bc946b8d3c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 2672 bytes
font_02_sfnt_off0000bf19.bin
cff71b6001944c5db33d874104366818be90fa8993354c670fa72ceae7a47f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 23424 bytes

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