Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c7321fc7d62b74…

MALICIOUS

PDF

43.6 KB Created: 2020-03-31 03:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c104f22f1f34c2e417e2079a93c7232 SHA-1: d8018bb06d1b1fd0ae8c2542aa24d83f36bb00b0 SHA-256: 01c7321fc7d62b742fa5ea0e3e7d2eb4e834ef21203b7d5ce41d6cf51848da99
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1204.002 Malicious File

The PDF document contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. The document body, though partially corrupted, contains text suggesting a lure to download an application, and the primary URL points to a page with similar phrasing. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass external link farm.

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://verifidentit.com/uploads/1/3/1/3/131380493/131380493.html#descargar+aplicacion+para+desbloquear+celulares+gratis
    • http://izapped.com/uploads/1/3/0/5/130590541/pobunelewatane.pdf
    • http://myaffiliatepages.org/uploads/1/3/0/2/130289333/fuzemoxidun.pdf
    • http://thefashionfarmer.com/uploads/1/3/1/4/131409546/gujefeluwiriraserim.pdf
    • http://aria-plays-games.com/uploads/1/3/0/5/130540501/givelaku.pdf
    • http://drug.golf/uploads/1/3/0/2/130289670/edf6d56.pdf
    • http://oh-m-y.org/uploads/1/3/0/4/130489803/tolitojalizodofe.pdf
    • http://windsormovingcompany.com/uploads/1/3/0/3/130313494/xoboxunuzuv_famawafudani_wisogasikibabiw.pdf
    • http://pepperminttrail.com/uploads/1/3/0/3/130379142/xafuvorujez_posugizesem.pdf
    • http://www.server.botanikaplants.com/uploads/1/3/1/0/131070559/sogavuxojoxuvetibo.pdf
    • http://rebeccakirkcounseling.com/uploads/1/3/0/4/130489157/a282eaefc.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683d.bin
e2053923399cdf09189bba5b9ada487577ccc45cfb4bb8f670837fe19ed347c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683D 9040 bytes
font_01_sfnt_off00008934.bin
a2f0e64d6975656d959a0794b9a965349b6a87240c16eb122ddb64596f86590d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8934 1704 bytes
font_02_sfnt_off0000915f.bin
89d4582d1f83965f42e23c0e6626d7ada7c01c22518cd1944fd4a7be269fea4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915F 6068 bytes

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