Malicious PDF — malware analysis report

Static analysis result for SHA-256 41345b2a65e0a0e5…

MALICIOUS

PDF

46.0 KB Created: 2020-06-13 01:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e881066a04d77a215cddd820f5e981ad SHA-1: 799c6439ad9afb293464d9df6d9471e04208a182 SHA-256: 41345b2a65e0a0e5cab3f2762fb462b5718d22fe48347e705e03808a10cb6ede
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO poisoning or directing users to malicious sites. The ML classifier strongly indicated maliciousness. The document body text is heavily obfuscated and contains embedded URLs that are part of this link farm, suggesting the primary purpose is to redirect users to potentially harmful content.

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://andrewkruep.com/uploads/1/3/1/8/131856146/131856146.html#dorothy+johnson+davran%25C4%25B1%25C5%259Fsal+sistem+t
    • http://megannasto.com/uploads/1/3/1/4/131407315/ea6eff8e5900743.pdf
    • http://mx.jessicaraeanderson.com/uploads/1/3/1/4/131437792/kejubevomad_lexuda_zoloj_zetedemajuve.pdf
    • http://cprfordaycareproviders.org/uploads/1/3/1/8/131856432/rajijimoxibuvevewu.pdf
    • http://drwlegal.com/uploads/1/3/1/6/131637074/gilane-lugerezipiro.pdf
    • http://openin4.com/uploads/1/3/1/3/131384082/mepasamovomamiwis.pdf
    • http://ohiovalleybuilder.com/uploads/1/3/0/5/130590403/1410905.pdf
    • http://diversecleaningservices.com/uploads/1/3/1/4/131483144/5298351.pdf
    • http://ns1.clinicapabloartero.com/uploads/1/3/0/8/130813453/3413077.pdf
    • http://internationalcarspotters.com/uploads/1/3/1/4/131414019/panelajexoxut.pdf
    • https://pevewedawisu.files.wordpress.com/2020/06/62858857065.pdf
    • https://rapisikuzuv.files.wordpress.com/2020/06/sagevuba.pdf
    • https://pomufoj.files.wordpress.com/2020/06/55303089701.pdf
    • https://wafasive.files.wordpress.com/2020/06/fowog.pdf
    • https://lubaxop.files.wordpress.com/2020/06/42900064870.pdf
    • https://satubawuk.files.wordpress.com/2020/06/78666115103.pdf
    • https://wozadegi651319453.files.wordpress.com/2020/06/xuzomabakadunape.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_off000086f2.bin
83f2cd52d9d38eb077adf1bcacdfcfe5f69613da5e017ad9b8bcc5077f28a9ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F2 10700 bytes

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