Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5bfe7212c473d8…

MALICIOUS

PDF

38.2 KB Created: 2020-06-04 00:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6535bf882d3d4a7a6ed8befeed0b6ec SHA-1: 0525b9d379ffcff478661ec2f4422f27fb17cff1 SHA-256: 3e5bfe7212c473d8c63582e607a870ced2e010087dd382ebe9a1ac34020ea99c
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains. This behavior is indicative of a link farm, often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://nzinmr.com/uploads/1/3/1/8/131872149/131872149.html#fungicida+natural+para+tomates
    • http://centralfreemethodist.com/uploads/1/3/0/6/130620163/d987b46af1d.pdf
    • http://mcrcontract.com/uploads/1/3/0/7/130738933/3298471.pdf
    • http://amber-it.com/uploads/1/3/0/6/130603851/1040099.pdf
    • http://designdanceandconsign.com/uploads/1/3/0/6/130603842/4429758.pdf
    • http://blindsshuttersmorefrisco.com/uploads/1/3/0/6/130621472/mibimofilimov-zonib-jerumexese-jokulum.pdf
    • http://onenacplusrealestatellc.com/uploads/1/3/0/6/130604072/7bae29b7bb7e4d4.pdf
    • http://parlorfloor.com/uploads/1/3/0/4/130476074/zirasebigor.pdf
    • http://jll-microsoftwilsonvilleproposal.com/uploads/1/3/2/3/132303245/9592845.pdf
    • http://vfwpost612.org/uploads/1/3/0/5/130551641/xowegokofefawi_kizoferivo.pdf
    • http://micropaintautoappearance.com/uploads/1/3/0/6/130639024/pixikubetarixaxovik.pdf
    • http://h2erelief.com/uploads/1/3/2/3/132303270/nadoduromu.pdf
    • http://thecreativespirit.ca/uploads/1/3/0/5/130547552/2921211.pdf
    • http://nzinmr.com/uploads/1/3/1/8/131872149/terms.html
    • http://nzinmr.com/uploads/1/3/1/8/131872149/dmca.html
    • http://nzinmr.com/uploads/1/3/1/8/131872149/policy.html
    • https://nadomanope.files.wordpress.com/2020/06/89245181253.pdf
    • https://fiwukezebara.files.wordpress.com/2020/06/55949170893.pdf
    • https://mopiwum.files.wordpress.com/2020/06/90947780591.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695b.bin
a4f7f93d4186beb0043884682679d9e2b3153f545aa6120091b8534f2682349d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695B 11000 bytes

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