Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8abd4e3a972a8d1…

MALICIOUS

PDF

39.3 KB Created: 2020-03-15 06:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f97e85955b21d0a9318728c4a06082b1 SHA-1: 4f47dc2ce1b67e2976d6c7ec3d232605741a60d2 SHA-256: f8abd4e3a972a8d164099aca457de86bb1435684453c539651371f63d78754a1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used in SEO poisoning or phishing campaigns to drive traffic to malicious sites. The document body, though partially obfuscated, contains text suggesting it is related to 'answers' for a chapter, likely a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous PDF_SEO_LINK_FARM heuristics further supports a malicious intent 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://host167.carmichaelnl.com/uploads/1/3/0/8/130813921/130813921.html#realidades+capitulo+2a-+7+answers
    • http://hardhatbuilders.net/uploads/1/3/0/6/130605280/848526231dcb3a.pdf
    • http://mta-sts.mail.stalpa.ch/uploads/1/3/0/7/130775668/gejik.pdf
    • http://journeyfilms.net/uploads/1/3/0/7/130775961/kaduropejotogabujuzi.pdf
    • http://irishuey.com/uploads/1/3/0/7/130775820/367bc3021.pdf
    • http://evrenselzenginlik.com/uploads/1/3/0/4/130483710/0c7ed35b98a.pdf
    • http://thedjbsmooth.com/uploads/1/3/0/2/130288757/puvibi_dufemexogaxomol_ligokomi.pdf
    • http://propertysitters.ca/uploads/1/3/0/2/130287291/5baf641c99679a.pdf
    • http://showupshutupandwrite.com/uploads/1/3/0/2/130287419/bebuxunif.pdf
    • http://tarrafaldjuntamo.org/uploads/1/3/0/9/130969637/59a151.pdf
    • http://sprivot.com/uploads/1/3/0/5/130543538/sumutabafedul-givoxofolikij-wipilagekok-rasizedu.pdf
    • http://www.sxmrentalcar.com/uploads/1/3/1/1/131164568/c1829a594.pdf
    • http://therailwaycottageshillingstone.com/uploads/1/3/0/8/130874125/7447946.pdf
    • http://impacnow.net/uploads/1/3/0/4/130488861/4334857.pdf
    • http://markroselab.org/uploads/1/3/0/5/130550921/67a6d28526390.pdf
    • http://mid-statesasphalt.com/uploads/1/3/0/6/130605120/e240574849b.pdf
    • http://oggoel.com/uploads/1/3/0/7/130739291/ff71450d735.pdf
    • http://webmail.citi5108.com/uploads/1/3/0/2/130291433/7449811.pdf
    • http://futurerevenuemedia1.com/uploads/1/3/0/6/130604210/lanagifi-suwugawivikut-juruwopewotan.pdf
    • http://paperlotus.com/uploads/1/3/0/5/130543190/0ad6f6df9364.pdf
    • http://edifyyounow.com/uploads/1/3/0/4/130476981/3856319.pdf
    • http://stilemans.com/uploads/1/3/0/2/130271017/3381190.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_off0000713b.bin
193d5a650c1f22c5f44db1e5978dd7eeefca16fa8d37b50e0c6cc9f14562e0b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x713B 8044 bytes