Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba135a3b9157b099…

MALICIOUS

PDF

34.1 KB Created: 2020-05-15 20:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b746fbd613b1648e28a4ed1789ab074d SHA-1: 9cd60f84c06ae19f75a312d34ed65ca3f3cf7adc SHA-256: ba135a3b9157b099267a5d68f93a4a10cafe6f4915728117d6a969346bfa7f22
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to contain embedded URLs, but the primary malicious activity is the mass external linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oxfordfitfun.com/uploads/1/3/0/6/130620598/130620598.html#accounting+is+the+information+system+that+quizlet PDF link annotation
    • http://dieselsdaughter.com/uploads/1/3/0/4/130479210/5a31ff9e95d48c3.pdfIn PDF document text
    • http://jerrygarciaarts.com/uploads/1/3/0/7/130775543/xilegog.pdfIn PDF document text
    • http://elysseceleste.com/uploads/1/3/1/4/131453715/a4b4f820.pdfIn PDF document text
    • http://makemoremoney2019.club/uploads/1/3/0/4/130489351/4231757.pdfIn PDF document text
    • http://wellreadpro.net/uploads/1/3/0/7/130738566/sezijezitogen-gakomudupol.pdfIn PDF document text
    • http://tigerlilylane.com/uploads/1/3/0/3/130324419/kakazuboje.pdfIn PDF document text
    • http://claudiarosales.com/uploads/1/3/0/7/130775817/5491468.pdfIn PDF document text
    • http://mambow.fr/uploads/1/3/0/2/130288520/jamolubowasuja_ginud_werukajizoja.pdfIn PDF document text
    • http://malvernautotags.net/uploads/1/3/0/7/130776423/c75c0d94613.pdfIn PDF document text
    • http://fitzcocapitalinc.com/uploads/1/3/1/8/131872017/2951496.pdfIn PDF document text
    • http://somersetfoodtrail.org/uploads/1/3/1/3/131379991/bozovananojogumup.pdfIn PDF document text
    • http://materieleselconstructor.com/uploads/1/3/0/7/130776099/voxasop_rujed_zumodilele.pdfIn PDF document text
    • http://cadecim.com/uploads/1/3/0/6/130620813/rogiluxuril_jufanigafajala_kunufadapidot.pdfIn PDF document text
    • http://photovideoarts.co/uploads/1/3/0/5/130588625/6278614.pdfIn PDF document text
    • http://ops-williamsfirsties.com/uploads/1/3/1/0/131070508/182f5a57158351.pdfIn PDF document text
    • http://visionsednetwork.com/uploads/1/3/1/3/131398020/namokokasefe.pdfIn PDF document text
    • http://thelostjewels.com/uploads/1/3/0/8/130813136/dewurewogifin_xuvadimob_xubuwe_nafumuvurej.pdfIn PDF document text
    • http://wildmillers.com/uploads/1/3/0/6/130604185/36d52225c4cac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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_off000056c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 11740 bytes
SHA-256: 688b09bac2bc91de2a17d3c0ed8e63cc2b296425ee550dfb4c9e9e1a0a366b7d

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