Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de05bcdb809e552…

MALICIOUS

PDF

34.0 KB Created: 2020-03-26 07:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 996a4f7ecb2453418409ea68edd2acbf SHA-1: d4d6d2f8b3c187cd0b9ea940ad05b7fc00a45a16 SHA-256: 8de05bcdb809e5525d6fd9fd6117ff683109b5e7576cbe4167368a2f62317ef1
96 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 are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though heavily corrupted, contains fragments of URLs and text related to tutorials, which are likely lures to encourage users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious.

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://whyagileteamsfail.com/uploads/1/3/0/7/130739084/130739084.html#ms+access+2010+advanced+tutorial+pdf PDF link annotation
    • http://www.blackcardu.stefanaarnio.com/uploads/1/3/0/5/130546036/jaditolukelibomur.pdfIn PDF document text
    • http://lifeonthepositive.com/uploads/1/3/0/3/130379172/110279.pdfIn PDF document text
    • http://oigidecht.com/uploads/1/3/0/6/130604599/ef66446e.pdfIn PDF document text
    • http://cyberloo.com/uploads/1/3/0/3/130379169/5717637.pdfIn PDF document text
    • http://tikadek.store/uploads/1/3/0/6/130621950/a594ee707.pdfIn PDF document text
    • http://decoratingmaine.com/uploads/1/3/0/8/130813417/zusadod_pusijaxarobodo_waloxuzu.pdfIn PDF document text
    • http://easyinsoles.com/uploads/1/3/0/7/130740001/6cff1.pdfIn PDF document text
    • http://www.mymusicshowcase.com/uploads/1/3/0/2/130289655/d2a9669a1235b2b.pdfIn PDF document text
    • http://gps7000.cl/uploads/1/3/0/5/130551429/c6d0a763d7bded.pdfIn PDF document text
    • http://capturedthat.com/uploads/1/3/0/2/130274098/nogowusevij-jafufumilabuw.pdfIn PDF document text
    • http://at-bikes.dk/uploads/1/3/0/2/130291582/3162635.pdfIn PDF document text
    • http://mychart-test.northwesternmedicine.org/uploads/1/3/0/6/130620823/ecbd72542.pdfIn PDF document text
    • http://2xch.com/uploads/1/3/0/6/130639481/zozit.pdfIn PDF document text
    • http://www.themouseholewoolery.com/uploads/1/3/0/5/130590432/768402.pdfIn PDF document text
    • http://howtoadwords.net/uploads/1/3/0/5/130539427/ae200993e897.pdfIn PDF document text
    • http://nuancetravelacademy.com/uploads/1/3/0/7/130775853/91d88.pdfIn PDF document text
    • http://classwithcroft.com/uploads/1/3/1/3/131380213/bigezikuxotogig.pdfIn PDF document text
    • http://groundtruthsalessystem.com/uploads/1/3/0/8/130874285/murasof_lotibezikewifo.pdfIn PDF document text
    • http://collegefootball2019.com/uploads/1/3/0/5/130589429/nekumewafiruzis-lolujasilosav-xodumuxusoro-gasidusan.pdfIn PDF document text
    • http://mindfulengagment.com/uploads/1/3/0/6/130605399/sixegutapeziditumone.pdfIn PDF document text
    • http://niftynegro.com/uploads/1/3/0/8/130814411/2ad676c.pdfIn PDF document text
    • http://mikaelmonk.com/uploads/1/3/0/6/130603976/regasemuva.pdfIn PDF document text
    • http://roofinginpinellas.com/uploads/1/3/0/3/130379463/zujomax-xovudumonus.pdfIn PDF document text
    • http://moresauce.net/uploads/1/3/0/6/130604350/9aa6dce7fc3.pdfIn PDF document text
    • http://4us2wire.com/uploads/1/3/0/7/130738859/5922688.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000600d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 6460 bytes
SHA-256: 3bd30e35352b7f0781c8c16ed64a0209c49b69c58b16880cf434fa1cbfa576ea

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