Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd88aaba57f54b…

MALICIOUS

PDF

36.8 KB Created: 2020-03-24 22:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8797cda06331f5b6c405586d32c44d8 SHA-1: f9d1dd6403f8e872386b1e276a26bf1dac4664c9 SHA-256: 38dd88aaba57f54b670b58dd2eba08881be3c90b9b60ab534bfe48261122ed8a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files. This suggests a link farm or a distribution mechanism for further malicious content. The document body contains a seemingly innocuous medical term, likely a lure to disguise the 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://filtraplus.com/uploads/1/3/0/9/130969315/130969315.html#elevated+hemoglobin+a1c+icd+10+code
    • http://www.moyocoyani.me/uploads/1/3/0/8/130813663/toluxod.pdf
    • http://nancebmecleaning.com/uploads/1/3/0/8/130813899/sopugakowavi.pdf
    • http://paideiadobem.com/uploads/1/3/0/4/130483795/memixulutu.pdf
    • http://top1percenter.com/uploads/1/3/0/8/130814245/vavuwovun.pdf
    • http://resolution8.net/uploads/1/3/0/4/130483900/c6b2a83c.pdf
    • http://www.bavarian-opera-academy.com/uploads/1/3/0/2/130289799/f26a8faa72eb8.pdf
    • http://gardenglassetc.com/uploads/1/3/0/2/130271148/tidetotetej.pdf
    • http://corporate-communication-solutions.com/uploads/1/3/0/6/130639811/5308830.pdf
    • http://hostmaster.knottyknotty.co.uk/uploads/1/3/0/7/130739353/vafozigizop-luwazutekufu-jokiz-zobumomejereb.pdf
    • http://trenton-locksmiths.com/uploads/1/3/1/0/131069890/7a20be1cb.pdf
    • http://stcolumbanusalumni.org/uploads/1/3/0/8/130874369/pujeviximini.pdf
    • http://hiawathaparkfriends.org/uploads/1/3/0/3/130324126/75e3124.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_off000069e7.bin
865a8ddd82bcba65f8033c5b05dde69812a8e7eb1034a6809a457679f6ee9b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 7164 bytes

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