Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22df6dca1ad3425…

MALICIOUS

PDF

41.3 KB Created: 2020-03-30 22:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 57fcbbc51376aceabc1712287b99fbf6 SHA-1: b490fa1cace427abee4a78a6afb5745faeecd0ae SHA-256: a22df6dca1ad342503932bcb0a9dcd9e5f4437bcc7f9c782110ab1f7bd017520
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric or generic slugs, indicative of a link farm or SEO spam operation. The document body, though heavily obfuscated, contains a URL that is also present in the list of extracted URLs. This suggests the primary purpose is to drive traffic to these external sites, potentially for malicious purposes such as phishing or malware distribution.

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://sdsufiji.com/uploads/1/3/0/8/130813536/130813536.html#metodo+sencillo+para+aprender+a+dividir+por+dos+cifras PDF link annotation
    • http://trigoncreative.net/uploads/1/3/0/6/130620578/d15b9.pdfIn PDF document text
    • http://plateauvalleytimes.com/uploads/1/3/0/5/130542718/2615658.pdfIn PDF document text
    • http://scbcdesmoines.com/uploads/1/3/0/4/130489371/werevipil.pdfIn PDF document text
    • http://amyswickedslush.net/uploads/1/3/0/7/130776123/demunada.pdfIn PDF document text
    • http://srohomepage.com/uploads/1/3/0/5/130589435/fbeabf3ccc54e0.pdfIn PDF document text
    • http://amberbeecollection.net/uploads/1/3/0/9/130969811/7323f3ce.pdfIn PDF document text
    • http://onsecondthoughtmagazine.org/uploads/1/3/0/5/130542813/getixojonume.pdfIn PDF document text
    • http://nouvellere.fr/uploads/1/3/0/8/130814120/2315499127.pdfIn PDF document text
    • http://performancemedicalsolutions.com/uploads/1/3/0/4/130483123/4087009.pdfIn PDF document text
    • http://commonreaders.info/uploads/1/3/0/4/130435978/gifezokoxapojeka.pdfIn PDF document text
    • http://affordablecommercialroofing.biz/uploads/1/3/0/7/130739363/d3d455d8.pdfIn PDF document text
    • http://lolas-hc.com/uploads/1/3/0/7/130775489/pafadovoluf.pdfIn PDF document text
    • http://bagelboulevard.com/uploads/1/3/0/6/130620483/xotagusipiz.pdfIn PDF document text
    • http://selinapeason.com/uploads/1/3/1/0/131070527/9004758.pdfIn PDF document text
    • http://eliteindustrialcompany.com/uploads/1/3/1/3/131381142/bimirowabomixo.pdfIn PDF document text
    • http://cherrypointah.com/uploads/1/3/0/3/130313117/4748684.pdfIn PDF document text
    • http://westwoodonline.nl/uploads/1/3/0/2/130271103/9007875.pdfIn PDF document text
    • http://soulpaint.online/uploads/1/3/0/4/130476294/pezomupogedefajabu.pdfIn PDF document text
    • http://sozolifecoach.com/uploads/1/3/0/7/130739155/cd5ce14a55.pdfIn PDF document text
    • http://autodiscover.greenmeteorteam.com/uploads/1/3/0/7/130738541/gediliroxumeb.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 1

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_off0000739c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 9276 bytes
SHA-256: 92a777d151a4e8add16504126d52fe423c74f954720c8d0c8d3db84f921ec805

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