Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d01b9f952d4321…

MALICIOUS

PDF

36.2 KB Created: 2020-05-18 07:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51884b2423780ae36551abf1333e1b5 SHA-1: 5c0c192d6a37596a800224ae2416784145cc5552 SHA-256: 98d01b9f952d4321fb9ef6b12bca5d360d1656a6ea9c73875d89b93a4814490e
94 Risk Score

Malware Insights

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

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. No scripts were extracted from this sample, but the extensive linking pattern is indicative of a malicious campaign, likely for SEO manipulation or to distribute further payloads.

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://luckritzformayor.org/uploads/1/3/0/2/130272428/130272428.html#cheestrings+ficello+nutrition+information
    • http://aubreyking.com/uploads/1/3/0/4/130476650/bisovewupamirowawej.pdf
    • http://mdheatingairconditioning.com/uploads/1/3/0/6/130620747/332bf.pdf
    • http://naiabeachstores.com/uploads/1/3/1/8/131857060/8513338.pdf
    • http://megangrecodpt.com/uploads/1/3/0/5/130544591/e865ef39d8.pdf
    • http://4lawsfamily.com/uploads/1/3/0/6/130604026/3982e19.pdf
    • http://practicalsolutiondevices.com/uploads/1/3/1/3/131384791/puzidavowusi.pdf
    • http://straightthegate.org/uploads/1/3/1/3/131398498/juwipatewapom-rovag.pdf
    • http://xn--pfnderhonig-m8a.com/uploads/1/3/0/5/130588821/1284326.pdf
    • http://mytorontolawnsprinklers.com/uploads/1/3/0/6/130604658/9537929.pdf
    • http://censeocomputing.com/uploads/1/3/1/8/131872281/391821.pdf
    • http://solustechnologies.net/uploads/1/3/0/5/130588622/d2677c7d.pdf
    • http://evreething.net/uploads/1/3/0/7/130776616/xatikubakuger.pdf
    • http://99spamassage.com/uploads/1/3/0/8/130874082/vujel.pdf
    • http://flowerwallco.com/uploads/1/3/1/8/131856244/wawutujipiwuko.pdf
    • http://girlpaintedbackwards.com/uploads/1/3/0/6/130604940/d16ea2fa.pdf
    • http://efrigon.com/uploads/1/3/1/4/131454155/3890012.pdf
    • http://kursharnsamoyeds.com/uploads/1/3/0/3/130323124/1138890.pdf
    • http://freegarageconversions.com/uploads/1/3/0/8/130874391/xovivus_dogotuxexelotu_sukomiguf.pdf
    • http://joysgreenkitchen.com/uploads/1/3/0/5/130588435/9480828.pdf
    • http://elocinstudio.com/uploads/1/3/0/4/130489475/2222345.pdf
    • http://bourkesbestbites.org/uploads/1/3/0/7/130776399/dd84a34b6e33a0d.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_off000061b8.bin
31084d32e64d78a9479f830d7f65b05f576214d120f3a559a122325e6230be06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 10312 bytes

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