Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1b6c0f073641d0…

MALICIOUS

PDF

31.7 KB Created: 2020-04-17 15:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3abfc51c550bf6446c14d43e2782ef1 SHA-1: ddcab3522826d3413ad8c64c20c9d61c13ed96e6 SHA-256: 9f1b6c0f073641d0f2df6dbcff442b04ebf31053737993d25419b429b957d0d4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to numerically-slugged PDFs on various domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute traffic to potentially malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

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://keatingphysicaltherapy.net/uploads/1/3/0/4/130436171/130436171.html#free+graffiti+alphabet+templates
    • http://nashvilleburnbootcampclub.com/uploads/1/3/0/8/130813899/8646721.pdf
    • http://tdemelectrical.com/uploads/1/3/0/5/130545597/7398286.pdf
    • http://itsforthepeople.com/uploads/1/3/1/3/131380433/fofabakaderedevuto.pdf
    • http://nevadabrokersponsor.com/uploads/1/3/0/5/130588461/gemipijame.pdf
    • http://gbnobbs.com/uploads/1/3/0/5/130588874/9aea8ca2a78.pdf
    • http://judithgamble.com/uploads/1/3/1/3/131383661/lafidelifawe.pdf
    • http://afifsyaifullah.net/uploads/1/3/0/2/130273893/jafilo-gimusupu-kovojamapomaxam.pdf
    • http://vacher.studio/uploads/1/3/1/4/131453990/divabijus_wufupalopajana_biwifeka.pdf
    • http://hedronmanagementconsulting.net/uploads/1/3/1/4/131438786/fajupokinaku_xanujujipekisaw.pdf
    • http://bendigo-plumbers.com/uploads/1/3/0/6/130639516/jogasasupekif.pdf
    • http://achillesaustralia.org/uploads/1/3/1/6/131606257/795fdd21c.pdf
    • http://beinspireddanceco.com/uploads/1/3/1/3/131383649/3296864.pdf
    • http://nvcvb.net/uploads/1/3/0/5/130590700/8243821.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_off0000553b.bin
37b0ecaaf7bedeaf02e51516750ac75497d676a9da6cdae8fb920dac197fe7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x553B 7476 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.